Office Automation developed a proposal for introducing a new computerized office system that will

improve word processing and interoffice communications for a particular company. Contained in the

proposal is a list of activities that must be accomplished to complete the new office system project. Use

the following relevant information about the activities:

The normal duration of activity B is uncertain as well as the crash time of activity F$.$ The estimated

weeks are as follows respectively:

Most optimistic time $-$ B$,$ F $(6,2)$

Most likely time B$,$ F $(8,3)$

Most pessimistic time B$,$ F $(10,4)$

Activity Description Immediate

Predecessor

Time $($weeks$)$ Cost Cost slope

Normal Crash Normal Crash

A Plan needs $-1083000070000?$

B Order equipment A $?6120000150000?$

C Install equipment B $107100000160000?$

D Set up training lab A $7640000?10000$

E Conduct training

course

D $1085000075000?$

F Test system C$,$ E $3?600000?$

REQUIRED:

Draw a network diagram based on the normal times given, illustrating the critical path routes

and determine the normal cost and duration to complete the project.

Determine ES$,$ EF$,$ LS$,$ LF and slack for each activity

Calculate the crash cost for activity D and crash time for activity F

Assume that the company wants to complete the project in six months or $26$ weeks. What

crashing decision do you recommend to meet the desired completion time at the least possible

cost$?$ Work through the network and attempt to make the crashing decision by inspection

indicate clearly the additional cost of crashing.

Determine ES$,$ EF$,$ LS$,$ LF and slack for each activity for the crashed project and what is the added

project cost required to meet the six month completion time