Inventory Management and Control in Business

 
Definition of
 
Inventory
 
1.
Inventories means 
the stock of the 
product 
of 
a
company and components thereof that makes 
up the
product. It includes the raw materials, work in progress
and 
finished
 
goods.
 
2.
It is 
the 
physical stock 
of 
items 
a 
business or
production 
organization 
kept in hand for 
the 
efficient
running of business or 
its
 
production.
 
Inventories 
are
 
:-
 
1.
Items in
 stock.
 
2.
Usable but 
idle
 
resources.
 
 
Inventory
 
control
P
r
o
c
e
ss
 
o
f
 
m
aintai
n
i
ng
 
opti
m
u
m
 
nee
d
ed
 
qu
an
t
ity
 
of
inventories 
for the 
smooth operation 
of
 
organization.
 
Classification of
 
inventories
 
Inventory
 
Indirect
i
n
v
e
n
t
o
r
y
 
In
 
process
inventory
 
Raw
 
material
inventory
 
Objectives 
of
 
inventory
 
control
 
The basic managerial objectives are 2
 fold:-
 
1.
Avoid 
over/under investment in
 
inventories.
 
2.
To 
provide right 
quantity and quality goods 
at 
right 
time 
at
proper value.
 
Objecti
v
es
of
inventory
control
 
Operating
objecti
v
es
 
Financial
objecti
v
es
 
Operating
 
objectives
 
1.
Availability 
of 
Materials
: All type 
of 
material available
at 
all 
time 
so that production 
may 
not be 
held 
up for
want 
of 
supply 
of
 materials.
 
 
2.
 
Minimizing the wastage 
: permit only uncontrollable
wastage. 
Avoid 
wastage 
by 
leakage theft,
embezzlement, 
spoilage( rust, dust 
,
 
dirt)
 
3
.
  
P
r
o
m
o
t
i
o
n
 
o
f
 
m
a
n
u
facturing
 
e
f
fici
e
nc
y
:
 
Wh
e
n
 
ri
g
ht
type 
of raw material is available 
at 
the 
right
 
time.
 
4. 
Better service to 
the 
customers
: Maintain proper
production 
flow 
to produce 
sufficient 
finished goods 
to
meet 
the 
demand 
of of the
 
customers
 
5. 
Control 
of 
production 
level
: 
To 
increase 
or 
decrease 
the
production 
as 
per 
the 
demand as well 
as 
to maintain proper
buffer 
stock 
to 
meet 
any eventuality in 
difficult
 
times.
 
6. 
Optimal level 
of 
inventories
: It is done in view 
as 
per 
the
operational requirements.it 
also 
avoids the 
out of stock
danger.
 
Financial
 
objectives
 
1.
Economy in purchasing: 
management 
makes every
attempt to purchase the raw materials in 
bulk 
quantity
and to take advantage 
of 
favorable market
 
condition.
 
 
2.
Optimum investment and 
efficient 
use 
of 
capital: 
The
finance management should set 
up 
maximum and
minimum levels 
of 
stocks 
to avoid deficiency 
or 
surplus
of 
stock
 
position.
 
3. 
Reasonable price
: Management should ensure supply
of 
raw materials 
at 
a reasonable low price without
sacrificing 
the 
quality 
of 
it thereby helping the cost 
of
production 
and 
quality 
of 
finished
 
goods.
 
Advantages 
of
 
inventory
 
1.
Delivery in 
time: 
as inventory stored 
aids 
smooth production,
the 
manufacturing company 
can 
earn reputation 
as a 
reliable
supply.
-
our finished goods can be raw 
materials 
for
 
buyers.
-
reputation 
can get 
more
 
customers
 
2.
Possibility of discount on bulk
 
purchase
 
3.
Efficiently 
handle unforeseen circumstances
: harthal, bandh 
or
other transportation 
difficulties 
do not hinder
 
production.
 
4.
No 
idling of 
workers 
and
 
machineries
.
 
Disadvantages of
 
inventory
 
1.
W
ork
i
ng
 
c
a
p
i
tal
 
t
i
ed
 
up
:
 
c
ant
 
u
t
i
li
z
e
 
t
h
e
 
a
m
ount
 
for
 
o
t
her
purposes 
nor 
it yield any
 
interest.
 
2.
More space 
required
: more inventories more 
 
is
 
the
 
space 
needed
and space accounts for
 
rent.
 
3.
Increase
 
i
n
sur
an
c
e
 
c
h
a
r
ge
s
:
 
Incr
e
ased
 
cost
 
of
 
handl
i
ng
 
and
manufacturing.
 
4.
Increased
 
o
ver
 
he
a
d
 
e
xpenses
:
 
S
e
curity
 
p
e
rs
o
nnel
 
requ
i
red
 
to
guard
 inventory.
 
5.
Chances of 
damage
: 
Pilferage, 
replacement, 
etc
 
more.
 
6.
Increased chance 
of
 
obsolesce
.
 
Inventories constitute a significant part 
of the 
working
capital.
 
I
n
ventory
  
con
t
rol
purchase
 
and
 
p
ro
du
c
t
i
o
n
 
u
n
i
t)
 
and
 
val
u
e
 
u
s
ed
 
i
n
 
u
n
i
t/physical
 
c
o
n
t
r
o
l(
c
o
n
trol
 
(Accounts
 
unit)
 
When
 
a
 
fi
r
m
 
f
e
e
l
 
s
h
o
r
tage
 
o
f
 
fi
n
ance
 
it
 
s
h
ould
 
t
ake
more 
care 
in its inventories rather than anything
 
else.
 
Ordering 
cost or procurement
cost or purchasing
 
cost
 
The cost that 
has 
to be spent in 
making 
purchase
 
order.
 
Includes all the expenditure 
associated 
on placing an
 
order.
-
postal service
 
expense
-
expenditure on stationary and
 
consumables.
-
travelling
 
expense.
-
ti
m
e
 
spent
 
by
 
purc
h
ase
 
depar
t
m
ent
 
for
 
o
rd
e
r
 
and
 
its
equivalence in
 
terms
 
of
 
money.
-
expenses on
 
supplies.
-
rent for 
premises 
occupied by purchase
 
department
-
legal fee for lawyers in case such situations
 
arises.
 
Inventory 
carrying
 
cost
 
Cost 
of 
blocking material 
as 
inventory 
. This
 
includes:-
 
1.
Cost 
of 
interest 
for the 
value 
of 
items 
stored 
as 
inventory.
2.
Salaries
 
o
f
 
per
s
onnel
 
m
anaging
 
v
a
ri
o
us
 
position
including security
 
personnel.
3.
Rent 
for the 
space occupied 
by the
 
inventories.
4.
The potential scope 
of 
loss , pilferage, obsolescence,
 
etc.
5.
Cost 
involved 
in 
the 
insurance 
of
 
inventories.
6.
Stationeries 
and consumables used by the 
store
 
people.
 
Under 
stocking 
or
 
shortages.
 
It is the 
cost 
of not having 
an 
item when it is 
needed, thus
affecting 
the 
sales 
of the
 company.
 
This 
may 
lead to 2
 
situations:-
 
1.
Back
 
logging
2.
Cancellation 
of orders.
 
Backlogging
: 
work is 
delayed beyond 
its 
schedule 
and 
eats 
away
the schedule 
time 
of next order thereby delaying the next
 
order.
 
Cancellation 
of 
order
: 
When 
buyer is 
not 
in a position to wait
 
.
 
Both the above results
 
in:
1.
Penality cost
: 
Purchase order 
will have 
an in 
built provision 
for
penality 
eg, 20% payment 
reduced 
for 
2 days 
delay,
 
etc
 
2.
Emergency 
replenishment: 
In an 
urgent 
situation 
if you 
want
good 
quality we 
may 
have to 
spent extra amount 
eg. 
Emergency
transportation
 
cost,etc.
 
3.
loss 
of good
 will
 
Over stocking
 
cost
 
This results when stock is left on hand when the demand
for the 
item has
 
ended.
 
The left over 
inventory 
may
 
be
-
Utilized 
at 
a later
 
stage.
-
Thrown 
out 
as
 
scrap.
 
1.
ABC
 
analysis
 
2.
VED
 
analysis
 
3.
SDE
 
analysis
 
4.
FSN
 
analysis
 
5.
HML
 
analysis
 
ABC
 
analysis
 
Process 
of 
classifying items 
using 
values 
as
 
measure.
Process of excursing selective 
control over
 
inventories.
 
Objectives 
of the
 
analysis
1.
Frame 
policy guidelines 
regarding 
control 
of
 
items.
 
2.
This policy enables material managers to exercise
selective control when 
he 
is confronted with 
large
number of
 
items.
 
3.
Expensive items are branded 
as 
A items(10%) 
the 
in
between 
as 
B(20%) and least 
expensive 
as
 C(70%)
 
The
 
method.
1.
All 
the 
item that are used in 
the industry 
are
 
identified.
2.
Items are listed as per 
the 
value.
3.
The number of 
high 
valued 
items 
, medium valued and
low valued items are
 
counted.
4.
Their percentage is 
found out.
 
 
The
 
concept
It is practically not feasible to exercise tight control
over 
all items 
in 
a 
large 
or in medium sized
organization. 
Hence 
we 
resort to classify 
the 
items
according to their
 
importance.
 
VED
 
analysis
 
Based 
on 
the critical values 
and 
shortage cost 
of the 
item.
Thus helps focus 
on 
vital
 
items.
 
Based 
on 
criticality 
the 
item 
can 
be 
classified into 3
categories viz; 
Vital, 
Essential and
 
Desirable.
 
Vital 
items are critically 
needed 
in a manufacturing unit.
The items with lower criticality included in E and lowest
in D.
 
The status 
of 
each  
item will 
be 
discussed with
justification 
by the 
material manager in consultation with
other 
departments of the manufacturing 
unit.
 
SDE
 
analysis
 
Classification based on lead time/
 
availability
 
S( 
Scarce) 
those 
item 
which are imported 
or 
which need
a lead 
time 
more than 6
 
months.
 
D(Difficult): The 
items 
which require 
less 
than 6 months
but 
more than a fort
 
night.
 
E
(
 
e
a
si
l
y
 
availa
b
le
)
:
 
It
e
m
s
 
which
 
are
 
a
v
ailable
 
e
a
sily
 
in
less than a fort
 
night.
 
Helps 
bring down 
lead time and out of 
stock
 
cost.
 
FSN
 
analysis
 
Classification based 
on 
frequency 
of 
issue 
or
 use.
 
F
 
=
 
Fast
 
m
o
v
i
n
g
 
it
em
s
 
t
h
at
 
a
r
e
 
f
r
equen
t
ly
 
i
s
s
ued
 
in
 
a
manufacturing
 
unit.
 
S = 
Slow 
moving items in a manufacturing
 
unit.
 
N = Non moving
 
item
 
This classification helps 
in 
establishing most suitable
layout 
by 
locating all fast moving items near 
the
dispensing 
window to reduce 
the 
handling
 
efforts.
 
HML
 
analysis
 
Classification based on 
unit
 
value.
 
H = high cost
M= 
medium
 
cost
L= Low
 
cost
 
This type 
of 
analysis helps in exercising control 
at 
the 
use
point 
. 
Proper 
authorization should be there for replacing
a high value
 
item
 
Definition 
of
 
EOQ
 
It
 
is
 
t
h
e
 
p
a
rt
i
cular
 
quantity
 
a
t
 
wh
i
ch
 
t
h
e
 
s
u
m
 
o
f
 
c
o
st
 
of
both 
the ordering 
and 
inventory 
carrying cost is
 
minimum.
 
Total
 
cost
 
= carrying cost + procurement cost
 
Consumption
 
rate
 
It is 
the 
rate 
at 
which 
the 
raw materials are
 
consumed.
 
If 
we 
plot a graph 
between 
time and level 
of 
inventory 
the
slope of the 
graph gives 
the 
consumption
 
rate
 
Constant consumption
 
rate.
If 
the 
raw material is consumed at same rate over 
the 
same
period 
of
 
time.
 
Actual / irregular 
consumption
 
rate
There will 
be 
variation in 
the 
production which leads to
different 
consumption rates 
at different time 
intervals.
Also influenced 
by 
factors like power
 
failure.
 
Replenishment.
 
The process of 
refilling 
the material 
as 
and when it is
consumed so 
that 
the 
inventory level 
is 
maintained within a
range
 
.
 
Types:-
1.
Instantaneous
 
replenishment
2.
Replenishment at constant
 
rate
3.
Replenishment at irregular
 
rate.
 
1.
Instantaneous replenishment
: refilling 
is 
done 
at 
one
time, 
at 
one 
instant 
for the one 
full 
lot
 
size.
 
2.
 
Replenishment 
at 
constant rate
: If 
we 
replenish the
used inventory 
at 
a constant rate . Usually practiced 
in
industries especially 
the 
ones which manufacture its
own raw
 
material.
 
3.
Replacement 
at 
irregular interval: 
The inventory is not
refilled 
at 
regular interval 
of
 
time.
 
Lead
 
time
 
Lead 
time 
is the time gap 
between 
starting 
or 
initiating
the 
process 
of 
ordering 
and 
receiving the ordered
quantity 
in
 
stores.
This is estimated 
by the 
past experience.
Lead 
time 
includes 
the
 
following:-
1.
Time 
taken to prepare purchase requisition and placing
the
 
order.
2.
Time 
taken to 
deliver 
purchase 
order 
to
 
vendor.
3.
Time 
taken 
for the 
vendor to
 
manufacture.
4.
T
i
m
e
 
tak
e
n
 
f
o
r
 
transp
o
rt
a
tion
 
f
r
om
 
ven
d
o
r
s
 
pl
a
ce
 
to
the
 
stores.
 
Reorder
 
point
 
This is 
the point 
which indicate that it is 
high 
time 
we place
the 
order 
failing which the 
stokes 
may 
get
 
exhausted.
 
Reorder 
point 
= 
lead time 
– predicted 
point 
of
 
exhaustion.
 
Eg. 
If 
we order once in every 
10 
days and 
the 
lead 
time 
is 3
days then 
ROP 
= 10 – 3 = 7
 
days.
 
Lead 
time
 
analysis.
 
Lead 
time depends on
 
:-
 
1.
T
h
e
 
u
r
gency
 
o
r
 
i
m
p
o
r
tance
 
o
f
 
t
h
e
 
comp
o
nents
 
in
 
t
h
e
manufacturing
 
process.
 
2.
Reliability 
of the
 
vendors.
 
Reserve stock(O-RS)/
Safety 
stock/Buffer
 
stock
 
To 
guard against disturbances 
of 
production process
either 
due 
to uncertainties in consumption rates 
or 
lead
time some extra 
stock 
is
 
maintained.
 
It serve the purpose 
of 
minimizing the 
chances 
of 
running
out of
 
stock.
 
It should 
not be 
very less 
or
 
excess.
 
Safety 
stock 
come 
to play when there is
 
:-
 
1
.
 
A
n
 
e
x
c
e
ss
 
reje
c
ti
o
n
 
o
r
 
wastage
 
in
process than
 
normal.
 
production
 
2. Rejection 
at 
the time of receipt due
 
to
-Poor 
production quality 
by
 
vendor.
- 
Damage 
to raw
 
material.
 
Factor of
 
uncertainty
 
Uncertainty is 
the 
main 
reason 
for 
having safety 
stock.
It 
may 
be due
 
to:-
 
1.
Uncertainty of demand
2.
Uncertainty 
of
 
delivery.
3.
Uncertainty 
of
 
quantity.
 
Uncertainty 
of 
demand: 
there will 
be 
a 
difference
between 
the 
expected demand and 
the 
actual 
demand
which is known 
as 
the 
forecast 
error. 
It is mainly
dependent on the 
buyers
 
side.
 
Uncertainty 
of 
delivery: 
depends 
on 
how long the 
lead
time 
is going to be. If something goes wrong with 
the
suppliers production 
the lead time 
may
 
prolong.
 
Uncertainty 
of quantity: 
this 
depends on how 
many
scrap or imperfect items the 
ordered 
quantity 
is 
going 
to
contain.
 
Determination 
of 
safety
stock
 
The
 
level
 
of
 
safety
 
stock
 
to
 
be
 
maintained
 
depends 
on
various factors
 
like:-
-Cost of item in
 
question
-Uncertainties in
 
demand
-Negative fall 
out of stock of 
this
 
item
-Spoilage 
due 
to 
long 
storage ,
 
etc
 
Optimum safety stock = maximum lead 
time 
in 
amount-
normal lead 
time 
in
 
amount.
 
Max.
 
lead
occurred.
 
ti
m
e
 
=
 
t
h
e
 
wor
s
t
 
possible
  
scenario
Foun
d
  
ou
t
 
in
  
co
n
sul
t
a
tion
 
with
 
t
h
e
 
purchase department or past
 
records.
 
Normal lead 
time 
= most expected lead 
time 
or the
average lead
 
time.
 
e.g.. If 
the 
maximum 
lead 
time 
is 
13 
days and the
average lead 
time 
is 
11.5 
days then 
13-11.5= 
1.5, a
stock 
that last 
for 
1.5 days is 
the 
optimum safety
stock.
 
Disposal of obsolete and
 
surplus
material
.
 
Obsolete material: 
Those materials 
or 
equipments which
are 
not 
damaged 
and 
which have economic work 
but 
are
no 
longer useful 
for the 
company’s 
operation 
due 
to
change in 
production
 
line.
 
The 
term 
can 
be 
associated with equipments, materials,
stocks, techniques,
 
etc.
 
It is very 
difficult 
to predict when 
the 
technology will
change leading to obsolescence. The company should
have sharp eye on the competition so that it 
can 
have
 
more
 
Causes 
for
 
Obsolescence
 
1.
Adoption of 
standardization
: 
lead to 
elimination 
of non standard
varieties.
 
2.
Adoption of 
new
 technology.
 
3.
Changes in production
 
design
 
4.
Cannibalization
: 
when a 
machine breaks 
down, it 
is, sometimes
rectified 
by using 
components 
of an 
identical machine 
which 
is
already not
 
functional.
 
5.
Faulty purchases 
: 
it the purchases 
are 
made 
in bulk 
so 
that 
they
can last for a very long
 
time.
 
Can be controlled by 
FSN
 
analysis
 
Surplus
 
material
 
Equipments which have 
no 
immediate use 
but 
had
accumulated 
due 
to faulty planning , forecasting and
purchasing. 
They have usage value in
 
future.
 
They are merely excess 
of 
what is in
 
need.
 
Easy to control compared to
 
obsolete.
 
Both
 
s
u
rplus
 
and
 
o
b
solete
 
m
aterials
condition.
 
are
 
in
 
good
 
Common causes 
for 
surplus
 
and
obsolete
 
materials
 
1.
Over
 ordering
 
2.
Faulty 
planning, 
purchasing and
 
forecasting.
 
3.
Reduced 
production.
 
4.
Drastic reduction in
 
wastage.
 
5.
Modification of
 
processes.
 
6.
Faults in 
store 
keeping 
and 
record
 
keeping.
 
They 
need to be disposed
 
?
 
1.
Keeping them is a costly
 affair.
 
2.
They need space.
 
3.
More 
security
 
personnel
 
4.
Separate 
store for 
maintaining
 
them.
 
5.
More chances 
of 
pilferage, damage
 
etc.
 
Stages 
of 
disposal
 
of
obsolete and
 
surplus.
 
1.
Finding: 
Periodic study must 
be 
carried 
out of 
all
items stocked 
or 
staying 
as 
inventory.
 
2.
R
e
cri
m
i
n
a
t
io
n
:
 
Alternati
v
e
 
ways
 
o
f
 
using
 
t
h
e
se
items must 
be 
explored within 
the
 industry.
 
3.
If they cannot be used any where then disposal 
act
is carried
 out.
 
Priorities 
in the 
process
 
of
disposal.
 
1.
Explore 
possibility of sending in
 
bulk.
2.
Dispose to 
original 
supplier if they show
 
interest.
3.
P
r
eference
 
m
ay
 
b
e
 
g
i
ven
 
to
 
b
u
yers
 
o
r
 
ven
d
o
r
s
 
who
have long term relation with 
the
 
company.
4.
Then
 
t
h
ink
 
o
f
 
others
 
who
 
m
ay
 
bu
y
 
a
t
 
best
 
poss
i
b
l
e
price.
5.
If it cannot 
be pushed 
off 
at 
best 
possible price, sell 
at
scrap
 
value.
6.
If
 
it
 
is
 
not
 
p
o
ssible
 
d
i
s
p
ose
 
t
hem
 
o
f
f
 
f
ree
 
o
f
 
co
s
t
 
to
someone who 
can 
use
 
them.
( sometimes when distribute to employers it 
may 
lead to
a
 
negative
 
si
d
e
 
e
f
fe
c
t
 
 
ethic
a
l
 
iss
u
e,
 
p
u
r
p
os
e
f
u
l
 
Process 
of 
disposal
 
of
obsolete 
and surplus
material.
 
B
y
 
nego
t
i
ation
 
by
 
which
 
b
u
y
e
rs
 
appr
o
a
c
hes
 
for
 
the
 
purchase 
of 
such
 
materials.
 
Auction.
 
Tenders.
 
Material
 
handling
 
Moving physical objects from 
one 
place 
to another 
as
parts, components, sub –assemblies, 
raw 
materials, 
or
finished goods 
ready 
for
 
shipment.
 
Defined 
as 
the function dealing with 
the 
preparation,
placing and positioning 
of 
materials to facilitate their
movement 
or
 
storage.
 
The moving of materials from 
raw 
material store to
through production to ultimate consumer with least
expenditure 
of 
time, 
effort 
so as to produce maximum
productive 
efficiency 
and lowest handling cost
 
Salient 
principles of material
handling
 
1. 
Principles related to
 
planning.
-
Planning 
principle: 
All 
handling activities 
must 
be 
properly
planned. 
Eg, 
use 
of 
same container throughout 
a 
handling
process.
-
System
 
principle:
 
Plan
 
a
 
system
 
integrating
 
as
 
many
 
handling
activities as 
is 
practical 
and coordinate full scope of
 
operation.
-
Material flow principle
: 
Plan an 
operation sequence and
equipment arrangement optimizing material 
flow. 
e.g plan
related work areas
 
together.
-
Simplification principle: 
Reduce 
or 
eliminate 
unnecessary
movements.
-
Gravity 
principle: 
wherever practicable 
utilize 
gravity 
to 
move
material
 
-Space 
utilization principle
: 
Avoid  
keeping 
too 
much 
of
inventory at 
temporary
 
store.
 
-Unit size 
principle: 
Increase 
the 
size 
, weight, 
quantity 
of 
the
load handled at a
 
time.
 
-Safety 
principle: 
provide 
safe 
handling method. Highlight
handling hazards or danger zones in a 
manufacturing
 
unit.
 
-Equipment selection principle: 
consider all the aspects 
of of the
material 
to be handled and the 
method 
to be 
utilized 
in 
terms 
of
the 
lowest 
overall cost. 
Eg. 
Select versatile
 
equipments.
 
-Standardization principle. 
Standardize methods, as well as type
and size of handling
 
equipment.
 
-Motion 
principle: 
fix 
minimum 
period 
for loading, 
unloading 
and
other
 
idleness.
 
-Idle 
time 
principle
: reduce 
the 
unproductive 
time 
of both 
handling
of equipment 
anf
 
manpower
 
-Maintenance principle: 
Set up regular 
maintanance
 
schedule
 
-Obsolescence principle: 
Identify and replace obsolete
 
matrrials.
 
-Fle
x
ibi
l
ity
 
pr
i
n
cip
l
e
:
 
p
urc
ha
s
e
 
eq
u
ip
m
ents
 
that
 
c
an
 
p
e
rform
 
a
variety of
 
tasks.
 
Lig
h
t
 
wei
g
ht
 
prin
c
i
p
l
e
:
 
o
p
t
 
for
 
e
quip
m
ent
 
t
h
at
 
h
ave
 
less
 
dead
weight.
 
Principles related to
 
operations.
 
-
Control principle: 
use martial handling principles 
to
improve production and inventory control. Materials 
may
be 
moved 
as 
per
 
schedule.
 
-Capacity principle: 
Production capacity should 
be 
fully
achieved.
 
-
Performance 
efficiency 
principle
: Determine 
efficiency 
of
handling performance in terms of expense per 
unit
 
handled.
 
Kindly 
refer 
material 
handling 
and
modern
 
material
 
Store
 
keeping
 
Store 
keeping: custody 
of 
all materials stocked in stores
for 
which 
store 
keeper is 
the
 
trustee.
 
St
o
res
 
ma
n
age
m
ent
 
res
p
o
n
sible
 
f
o
r
 
p
r
o
per
 
recei
p
t
 
,
custody and issue 
of
 
materials.
 
Function of stores
 
department
 
1.
To 
receive 
materials 
and check them 
for
 
identification
2.
To 
correctly 
position all 
materials 
and supplies within
the
 
stores
3.
Maintain 
stock safely 
in good
 
condition.
4.
Is
s
u
e
 
m
a
t
er
i
al
 
on
l
y
 
on
 
r
e
q
u
is
i
tion
 
b
y
 
auth
o
r
i
z
ed
person.
5.
Maintain 
up 
to 
date
 
record
6.
Ma
k
e
 
s
u
r
e
 
the
 
s
t
o
r
e
 
i
s
 
clean
 
a
n
d
 
i
n
 
g
oo
d
 
w
orking
condition.
7.
Optimum 
utilization 
of 
store
 
space
8.
Initiate 
process 
of 
purchasing 
at 
the 
right
 
time.
9.
Coo
r
din
a
t
e
 
and
 
c
o
o
pe
r
a
t
e
 
wi
t
h
 
v
arious
 
departme
n
t
s
like 
purchase, 
production,
 
etc.
 
Location 
of
 
store
- Minimize total handling costs and other costs related
store
 
operation.
 
-Location should 
be 
according 
to 
the 
nature and value
of 
materials to 
be
 
stored.
 
-Raw materials are 
stored 
need to 
the 
first
 
operation.
 
-In process material close to 
the 
next
 
operation.
 
-Finished goods 
near 
the shipping
 
area
 
-All departments should have 
easy
 
assess.
 
List of available store
 
space
 
1.
Platform
2.
Floor
 
space
3.
Rack
4.
Shelves
5.
Bins
6.
Trays
7.
Drums
8.
Barrels
 
they 
can 
be stored 
as 
a unit, a 
tier, 
a row 
or 
a
 
section
 
Stock
 
verification
 
1. 
Annual physical
 
verification:
 
-
Verification 
officer 
individually 
or 
in team verifies
stocks 
in 
the 
stores once 
in 
a year checking all
relevant documents 
like 
bin cards, 
stores 
ledger,
 
etc.
 
-
After verification a list consisting 
of 
shortages,
damages, 
surplus 
is given to 
the
 
management.
 
-
During verification 
the stores 
wont 
be
 
functioning.
 
2. 
Perpetual 
inventory
 
control
 
-Continuous check through 
out the 
year 
in 
such a way
that 
each 
item is checked 
at 
least 
once 
in a
 
year.
 
-‘A method 
of recording 
stores balances after every
receipt and issue to facilitate regular checking 
and 
to
obviate closing down 
for 
stock
 
taking”
 
-Priority 
given to A items then B and least to
 
C.
 
-Incidentally help continuous 
stock
 
taking.
 
Errors 
in
 
stores
 
1.
Clerical
 
mistakes.
 
2.
Improper 
storage e.g, 
camphor 
 
volatile.
 
3.
Pilferage 
( steal items that are not that
 
valuable)
 
4.
Leakage.
 
5.
Careless
 
handling
 
6.
Handling
 
loss.
 
Store
 
layout
 
1.
Section 
adjacent 
to 
store 
should be 
kept reserved 
for 
receipt 
of
materials 
and 
for 
its inspection 
before
 
storage.
 
2.
Minimize 
handling and transportation of
 
materials.
 
3.
Optimum utilization of floor 
space and
 
height.
 
4.
Shelves, 
racks 
etc should be 
situated 
in 
clearly 
defined 
leaves
so 
that he 
items 
are 
quickly stored 
and 
located 
for 
physical
counting and
 
issuing.
 
5.
Min lines 
should be between 
1.5 to 3 m wide 
depending 
on 
the
type of 
material 
and 
amount 
of 
traffic
 
involved.
 
6.
Storage space should 
be 
clearly marked to ensure 
easy
and 
quick
 
identification.
7.
Storage 
space should 
be 
protected against waste
damages, pilferage,
 
etc.
8.
Place 
for storing 
material based 
on 
material
characteristics.
9.
Lay 
out 
should 
be 
such hat it 
can 
make use 
of 
modern
material handling equipments like fork lifts, trucks,
conveyors,
 
etc
10.
Store 
keeper is 
not 
compelled to 
put 
newly arrived
material on the top of the 
old.
11.
20 
to 
25% due 
space in 
each 
portion 
of the store for
further
 
expansion.
 
Records
 
Store
r
e
c
o
r
d
s
.
 
Store
 
ledger
 
BIN
 
card
 
Bin
 
card
 
The
 
d
o
cu
m
ent
 
t
h
at
 
recor
d
s
 
t
h
e
 
exa
c
t
 
qu
anti
t
y
 
of
material available in the 
store 
at 
a 
give
 
time.
 
For 
each 
material a separate 
bin 
card 
is
 
maintained.
 
prepared by 
store
 
keeper.
 
Record 
of 
quantity only
 
Entry 
made 
immediately after 
each
 
transaction
 
Kept 
inside
 
store.
 
Stores 
ledger/
 
perpetual
inventory
 
cards
 
Identical 
to 
bin 
card 
but 
here the money value is 
also
shown.
 
Entries are 
made
 
periodically.
 
Prepared 
by 
Accounts
 
department
 
Outside
 
store.
 
Advantages 
of
 
record.
 
1.
Efficiency 
of
 
economy.
 
2.
Settlements 
of 
disputes with credits, debits, insurance
etc.
 
3.
Check against under 
stocking/ 
over
 
stocking.
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Inventory refers to the stock of products, raw materials, and goods in various stages of production within a company. Effective inventory management is crucial for ensuring smooth operations, optimizing resources, and meeting customer demands. It involves categorizing inventories, setting objectives for control, and achieving operational and financial goals. Operating objectives focus on material availability, waste reduction, manufacturing efficiency, customer service, production control, and optimal inventory levels. Financial objectives aim at achieving economies in purchasing and maintaining healthy financial practices.

  • Inventory management
  • Business operations
  • Supply chain
  • Efficiency
  • Financial goals

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  1. Definition of Inventory 1.Inventories means the stock of the product of a company and components thereof that makes up the product. It includes the raw materials, work in progress and finished goods. 2.It is the physical stock of items a business or production organization kept in hand for the efficient running of business or its production.

  2. Inventories are :- 1. Items in stock. 2. Usable but idle resources. Inventory control Process of maintaining optimum needed quantity of inventories for the smooth operation of organization.

  3. Classification of inventories Rawmaterial inventory Inprocess inventory Inventory Indirect inventory

  4. Objectives of inventory control The basic managerial objectives are 2 fold:- 1. Avoid over/under investment in inventories. 2. To provide right quantity and quality goods at right time at proper value.

  5. Operating objectives Objectives of inventory control Financial objectives

  6. Operating objectives 1. Availability of Materials: All type of material available at all time so that production may not be held up for want of supply of materials. 2. Minimizing the wastage : permit only uncontrollable wastage. Avoid wastage embezzlement, spoilage( rust, dust , dirt) by leakage theft,

  7. 3. Promotion of manufacturing efficiency: When right type of raw material is available at the right time. 4. Better service to the customers: Maintain proper production flow to produce sufficient finished goods to meet the demand of of the customers

  8. 5. Control of production level: To increase or decrease the production as per the demand as well as to maintain proper buffer stock to meet any eventuality in difficult times. 6. Optimal level of inventories: It is done in view as per the operational requirements.it also avoids the out of stock danger.

  9. Financial objectives 1. Economy in purchasing: management makes every attempt to purchase the raw materials in bulk quantity and to take advantage of favorable market condition. 2. Optimum investment and efficient use of capital: The finance management should set up maximum and minimum levels of stocks to avoid deficiency or surplus of stock position.

  10. 3. Reasonable price: Management should ensure supply of raw materials at a reasonable low price without sacrificing the quality of it thereby helping the cost of production and quality of finished goods.

  11. Advantages of inventory 1. Delivery in time: as inventory stored aids smooth production, the manufacturing company can earn reputation as a reliable supply. - our finished goods can be raw materials for buyers. - reputation can get more customers 2. Possibility of discount on bulk purchase 3. Efficiently handle unforeseen circumstances: harthal, bandh or other transportation difficulties do not hinderproduction. 4. No idling of workers and machineries.

  12. Disadvantages of inventory 1. Working capital tied up: cant utilize the amount for other purposes nor it yield any interest. 2. More space required: more inventories more is the space needed and space accounts for rent. 3. Increase insurance charges: Increased cost of handling and manufacturing. 4. Increased over head expenses: Security personnel required to guard inventory. 5. Chances of damage: Pilferage, replacement, etc more. 6. Increased chance of obsolesce.

  13. Inventories constitute a significant part of the working capital. Inventory purchase and production unit) and value (Accounts unit) control used in unit/physical control( control When a firm feel shortage of finance it should take more care in its inventories rather than anything else.

  14. Ordering cost or procurement cost or purchasing cost The cost that has to be spent in making purchase order. Includes all the expenditure associated on placing an order. - postal service expense - expenditure on stationary and consumables. - travelling expense. -time spent by purchase department for order and its equivalence in terms of money. - expenses on supplies. - rent for premises occupied by purchase department - legal fee for lawyers in case such situationsarises.

  15. Inventory carrying cost Cost of blocking material as inventory . This includes:- 1. Cost of interest for the value of items stored as inventory. 2. Salaries of personnel managing including security personnel. 3. Rent for the space occupied by the inventories. 4. The potential scope of loss , pilferage, obsolescence, etc. 5. Cost involved in the insurance of inventories. 6. Stationeries and consumables used by the store people. various position

  16. Under stocking or shortages. It is the cost of not having an item when it is needed, thus affecting the sales of the company. This may lead to 2 situations:- 1. Back logging 2. Cancellation of orders.

  17. Backlogging: work is delayed beyond its schedule and eats away the schedule time of next order thereby delaying the nextorder. Cancellation of order: When buyer is not in a position to wait. Both the above results in: 1. Penality cost: Purchase order will have an in built provision for penality eg, 20% payment reduced for 2 days delay, etc 2. Emergency replenishment: In an urgent situation if you want good quality we may have to spent extra amount eg. Emergency transportation cost,etc. 3. loss of good will

  18. Over stocking cost This results when stock is left on hand when the demand for the item has ended. The left over inventory may be - Utilized at a later stage. - Thrown out as scrap.

  19. 1. ABC analysis 2. VED analysis 3. SDE analysis 4. FSN analysis 5. HMLanalysis

  20. ABC analysis Process of classifying items using values as measure. Process of excursing selective control over inventories. Objectives of the analysis 1. Frame policy guidelines regarding control of items. 2. This policy enables material managers to exercise selective control when he is confronted with large number of items. 3. Expensive items are branded as A items(10%) the in between as B(20%) and least expensive as C(70%)

  21. The method. 1. All the item that are used in the industry are identified. 2. Items are listed as per the value. 3. The number of high valued items , medium valued and low valued items are counted. 4. Their percentage is found out. The concept It is practically not feasible to exercise tight control over all items in a large or in medium sized organization. Hence we resort to classify the items according to their importance.

  22. VED analysis Based on the critical values and shortage cost of the item. Thus helps focus on vital items. Based on criticality the item can be classified into 3 categories viz; Vital, Essential and Desirable. Vital items are critically needed in a manufacturing unit. The items with lower criticality included in E and lowest in D. The status of each justification by the material manager in consultation with other departments of the manufacturing unit. item will be discussed with

  23. SDE analysis Classification based on lead time/ availability S( Scarce) those item which are imported or which need a lead time more than 6 months. D(Difficult): The items which require less than 6 months but more than a fort night. E( easily available): Items which are available easily in less than a fort night. Helps bring down lead time and out of stock cost.

  24. FSN analysis Classification based on frequency of issue or use. F = Fast moving items that are frequently issued in a manufacturing unit. S = Slow moving items in a manufacturing unit. N = Non moving item This classification helps in establishing most suitable layout by locating all fast moving items near the dispensing window to reduce the handling efforts.

  25. HML analysis Classification based on unit value. H = high cost M= medium cost L= Low cost This type of analysis helps in exercising control at the use point . Proper authorization should be there for replacing a high value item

  26. Definition of EOQ It is the particular quantity at which the sum of cost of both the ordering and inventory carrying cost is minimum. Total cost = carrying cost + procurement cost

  27. Consumption rate It is the rate at which the raw materials are consumed. If we plot a graph between time and level of inventory the slope of the graph gives the consumption rate Constant consumption rate. If the raw material is consumed at same rate over the same period of time. Actual / irregular consumption rate There will be variation in the production which leads to different consumption rates at different time intervals. Also influenced by factors like power failure.

  28. Replenishment. The process of refilling the material as and when it is consumed so that the inventory level is maintained within a range . Types:- 1. Instantaneous replenishment 2. Replenishment at constant rate 3. Replenishment at irregular rate.

  29. 1. Instantaneous replenishment: refilling is done at one time, at one instant for the one full lot size. 2. Replenishment at constant rate: If we replenish the used inventory at a constant rate . Usually practiced in industries especially the ones which manufacture its own raw material. 3. Replacement at irregular interval: The inventory is not refilled at regular interval of time.

  30. Lead time Lead time is the time gap between starting or initiating the process of ordering and receiving the ordered quantity in stores. This is estimated by the past experience. Lead time includes the following:- 1. Time taken to prepare purchase requisition and placing the order. 2. Time taken to deliver purchase order to vendor. 3. Time taken for the vendor to manufacture. 4. Time taken for transportation from vendors place to the stores.

  31. Reorder point This is the point which indicate that it is high time we place the order failing which the stokes may get exhausted. Reorder point = lead time predicted point of exhaustion. Eg. If we order once in every 10 days and the lead time is 3 days then ROP = 10 3 = 7 days.

  32. Lead time analysis. Lead time depends on :- 1. The urgency or importance of the components in the manufacturing process. 2. Reliability of the vendors.

  33. Reserve stock(O-RS)/ Safety stock/Buffer stock To guard against disturbances of production process either due to uncertainties in consumption rates or lead time some extra stock is maintained. It serve the purpose of minimizing the chances of running out of stock. It should not be very less or excess.

  34. Safety stock come to play when there is :- production 1. An excess rejection or wastage in process than normal. 2. Rejection at the time of receipt due to -Poor production quality by vendor. - Damage to raw material.

  35. Factor of uncertainty Uncertainty is the main reason for having safety stock. It may be due to:- 1. Uncertainty of demand 2. Uncertainty of delivery. 3. Uncertainty of quantity.

  36. Uncertainty of demand: there will be a difference between the expected demand and the actual demand which is known as the forecast error. It is mainly dependent on the buyers side. Uncertainty of delivery: depends on how long the lead time is going to be. If something goes wrong with the suppliers production the lead time may prolong. Uncertainty of quantity: this depends on how many scrap or imperfect items the ordered quantity is going to contain.

  37. Determination of safety stock The level of safety stock to be maintained depends on various factors like:- -Cost of item in question -Uncertainties in demand -Negative fall out of stock of this item -Spoilage due to long storage , etc Optimum safety stock = maximum lead time in amount- normal lead time in amount.

  38. Max. lead occurred. purchase department or past records. time = the worst possible scenario Found out in consultation with the Normal lead time = most expected lead time or the average lead time. e.g.. If the maximum lead time is 13 days and the average lead time is 11.5 days then 13-11.5= 1.5, a stock that last for 1.5 days is the optimum safety stock.

  39. Disposal of obsolete and surplus material. Obsolete material: Those materials or equipments which are not damaged and which have economic work but are no longer useful for the company s operation due to change in production line. The term can be associated with equipments, materials, stocks, techniques, etc. It is very difficult to predict when the technology will change leading to obsolescence. The company should have sharp eye on the competition so that it can have more

  40. Causes for Obsolescence 1. Adoption of standardization: lead to elimination of non standard varieties. 2. Adoption of new technology. 3. Changes in production design 4. Cannibalization: when a machine breaks down, it is, sometimes rectified by using components of an identical machine which is already not functional. 5. Faulty purchases : it the purchases are made in bulk so that they can last for a very long time. Can be controlled by FSN analysis

  41. Surplus material Equipments which have no immediate use but had accumulated due to faulty planning , forecasting and purchasing. They have usage value in future. They are merely excess of what is in need. Easy to control compared to obsolete. are in good Both surplus and obsolete materials condition.

  42. Common causes for surplus and obsolete materials 1. Over ordering 2. Faulty planning, purchasing and forecasting. 3. Reduced production. 4. Drastic reduction in wastage. 5. Modification of processes. 6. Faults in store keeping and record keeping.

  43. They need to be disposed ? 1. Keeping them is a costly affair. 2. They need space. 3. More security personnel 4. Separate store for maintaining them. 5. More chances of pilferage, damage etc.

  44. Stages of disposal of obsolete and surplus. 1. Finding: Periodic study must be carried out of all items stocked or staying as inventory. 2. Recrimination: Alternative ways of using these items must be explored within the industry. 3. If they cannot be used any where then disposal act is carried out.

  45. Priorities in the process of disposal. 1. Explore possibility of sending in bulk. 2. Dispose to original supplier if they show interest. 3. Preference may be given to buyers or vendors who have long term relation with the company. 4. Then think of others who may buy at best possible price. 5. If it cannot be pushed off at best possible price, sell at scrap value. 6. If it is not possible dispose them off free of cost to someone who can use them. ( sometimes when distribute to employers it may lead to a negative side effect ethical issue, purposeful

  46. Process of disposal of obsolete and surplus material. By negotiation by which buyers approaches for the purchase of such materials. Auction. Tenders.

  47. Material handling Moving physical objects from one place to another as parts, components, sub assemblies, raw materials, or finished goods ready for shipment. Defined as the function dealing with the preparation, placing and positioning of materials to facilitate their movement or storage. The moving of materials from raw material store to through production to ultimate consumer with least expenditure of time, effort so as to produce maximum productive efficiency and lowest handling cost

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