CPM prob-1

From the following data calculate NWD. Identify the critical path & its duration. Calculate EST, EFT, LST, LFT & TF for each activity.

NWD Diagram

 

Path	Duration
1-2-5-6	6+7+5                =18
1-3-6	5+6                   =11
1-2-3-6	6+8+6               =20
1-2-3-4-5-6	6+8+5+4+5        =28 -Critical Path
1-2-4-5-6	6+4+4+5           =19
1-3-4-5-6	5+5+4+5           =19

Table showing EST, EFT etc

Activity	Duration	EST	EFT	LST	LFT	TF
1-2	6	0	6	0	6	0
1-3	5	0	5	9	14	9
2-3	8	6	14	6	14	0
2-4	4	6	10	15	19	9
2-5	7	6	13	16	23	10
3-4	5	14	19	14	19	0
3-6	6	14	20	22	28	8
4-5	4	19	23	19	23	0
5-6	5	23	28	23	28	0