(V) Resource-Sharing Activities 1

RESOURCE-SHARING ACTIVITIES

IN REPETITIVE PROJECTS

Model and schedule resource-sharing activities

for the Sequence Step Algorithm

Presented by

Chachrist Srisuwanrat

2008

(V) Resource-Sharing Activities 2

4. RESOURCE-SHARING ACTIVITIES

Activities sharing one or more

resources, called “resource-sharing

activities”

“Shared Resources”

How to schedule shared resources?

What could be the problems?

(V) Resource-Sharing Activities 3

Examples of Repetitive Projects with

Resource-Sharing Activities

(V) Resource-Sharing Activities 4

Considerations When Scheduling

Resource-Sharing Activities

Need to collect CIT and determine CLT

• In which sequence step?

Need to delay resources’ arrival dates to eliminate idle time

• Can the idle time in shared resources be eliminated?

Need to allocate shared resource to activities

• Which resource-sharing activity gets the shared resource first?

Imposing CLT might change: • CIT for the shared resource itself and of other resources

• Working sequences for the shared resource?

Supplementary Presentation V

(V) Resource-Sharing Activities 5

Scheduling Resource-Sharing Activities

When using SQS-AL to schedule repetitive projects with

resource-sharing activities, schedulers must pay

attention to:

• Increasing idle time from SQS to SQS

• Changes in work sequence for shared resources

• Slow production rates of dependents between the

resource-sharing activities

• Precedence relationships between resource-sharing

activities (e.g., direct or indirect)

• Proximity of start dates for resource-sharing activities

• Effect of assigning CLT on their dependents

(V) Resource-Sharing Activities 6

(a) Determine CLTXY in SQS2

(b) Determine CLTXY in SQS3

In Which SQS? (SQS2 or SQS3)

Activities X and Y share the

same Resource ResXY.

(V) Resource-Sharing Activities 7

Can the idle time in shared be

eliminated?

(a) Determine CLTXY in SQS2 (b) Determine CLTXY in SQS4

(V) Resource-Sharing Activities 8

(a) Using two dedicated resources (b) Introducing a work break

(c) Speeding Activity B (d) Lowering Activities X and Y

Solutions for shared resources when their idle time cannot be eliminated

(V) Resource-Sharing Activities 9

Does the working sequences

change after assigning CLT?