$3\mathrm{.}40-$ A project has been defined to contain the following list of activities along with their required times for completion.

Activity no$.$ immediate Activity time$($weeks$)$ predecessors

$1$ collect requirements $3$

$2$ Analyze Processes $21$

$3$ Analyze data $22$

$4$ Design Processes $62$

$5$ Design data $33$

$6$ Design screens $23,4$

$7$ Design reports $44,5$

$8$ program $56,7$

$9$ test and documents $77$

$10$ install $28,9$

Draw a network diagram for the activities.

Calculate the earliest expected completion time.

Show the critical path.

What would happen if activity $6$ were revised to take six

weeks instead of two weeks?