assessing resources

8/7/2019 Assessing Resources

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In considering the duration of an activity

it is essential to consider the availability

of resources for that activity

Assessment of resources is vital

Aggregation charts are one of the tools

to assess resources



Time-limited problems

¾ Project must me completed by a specific

date Resource-limited problems

¾ The project must be completed with limited

resources although this might mean

extending the project deadline



By doing time analysis, minimum time

possible for completing the project is

obtained Take minimum time as the time limit

Adjust the timing of any activity that may

affect resource requirement within thetotal float of activity (TF= LFT-EST-

Duration)



Prepare a list of activities ranked in order of their EST

Produce a resource aggregation chart (shows all theresources required when all activities start as soon aspossible)

Prepare a list of activities ranked in order of their LST

(=LFT-Duration)

Produce a resource aggregation chart (shows all the

resources required when all activities start as late aspossible)

Compare the two obtained aggregation charts andfind compromise between these two extreme

situations



Similar to unlimited resource aggregation

chart

If the total demand exceed the supplythat activity must be delayed

Activity orders are based on priorities

For activities with same start time sortingis based on their total float (less total

float comes first)



Earliest activities are given resources first

Not all activities can receive their

resources at their earliest start time sothey need to be delayed until resources

become available



From unlimited resource

aggregation



Consider the following time and resourcedata for a small project subject toresource constraint of 2 men only. How

do you manage resources to finish the

project on time?Activity Preceding

activity

Duration Labour

requirement

A - 1 2 men

B - 2 1 man

C A 1 1 man

D - 5 1 man

E B 1 1 man

F C 1 1 man



Establish precedence diagram (AOA)

1

1 3

0

0 0

3

2 4

2

2 4

4

5 5

A

C

F

D

EB

1

1

1

1

2

5



Find the critical path

1

1 3

0

0 0

3

2 4

2

2 4

4

5 5

A

C

F

D

EB

1

1

1

1

2

5



Arrange activities based on EST and

obtain TF for each activity

Activity Duration EST LST EFT LFT TF Labour

requirements

A 1 0 0 1 3 2 2 men

B 2 0 0 2 4 2 1 man

D 5 0 0 5 5 0 1 man

C 1 1 3 2 4 2 1 man

E 1 2 4 5 5 2 1 man

F 1 2 4 5 5 2 1 man



Establish aggregation chart based on

sorted EST

Number of

men required

Time

scale indaysD

0 54321

B

4

3

2

1

E

FCA Resourceavailability



Sort activities based on LST

Activity Duration EST LST EFT LFT TF Labour

requirements

A 1 0 0 1 3 2 2 men

B 2 0 0 2 4 2 1 man

D 5 0 0 5 5 0 1 man

C 1 1 3 2 4 2 1 man

E 1 2 4 5 5 2 1 man

F 1 2 4 5 5 2 1 man



Draw aggregation chart based on LST

(similar to EST!!!)

Number of

men required

Time

scale indaysD

0 54321

B

4

3

2

1

E

FCA Resourceavailability



At anytime we need more than 2 men to

get the job done

Based on the current resources the delayis inevitable

Lets assume we cannot increase our

resources then we definitely need todelay the project; how do you do it?



We stick to two men and the job is

delayed for 1 day

Number of

men required

tD

0 54321

B

4

3

2

1

E FC

A

Resourceavailability

6



Assume that the management states

that the duration of 5 days must be

maintained and he increase theresources from 2 men to 3 men. How do

you allocate resources?



It shows that from day 2 to day 4 we

need to have 3 men available

Number of

men required

Time

scale indaysD

0 54321

B

4

3

2

1

E F

C

A

Resourceavailability



Resource requirements for each activitymust be specified in order to performreliable scheduling

Resources must be classified and theavailability and constraints specified

A Resource Aggregation Profile(s) is anessential tool for resource management

If the resource aggregation indicates that aconstraint is being exceeded, and float isavailable the resource usage is 'smoothed'

i.e. the start of activities is delayed

assessing resources

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