Dave Fletcher was able to determine the activity times for constructing his laser scanning machine. Fletcher would like to determine​ ES, EF,​ LS, LF, and slack for each activity. The total project completion time and the critical path should also be determined. Here are the activity​ times:

Dave Fletcher was able to determine the activity times for constructing his laser scanning machine. Fletcher would like to determine ES, EF, LS, LF, and slack for each activity. The total project completion time and the critical path should also be determined. Here are the activity times:

Activity	Time​ (weeks)	Immediate​ Predecessor(s)	Activity	Time​ (weeks)	Immediate​ Predecessor(s)
A	77	minus−	E	44	B
B	88	minus−	F	77	B
C	33	A	G	1010	​C, E
D	22	A	H	88	D​ , F

​Dave's earliest start​ (ES) and earliest finish​ (EF) are:

Activity	ES	EF
A	00	77

B

00

88

C

77

1010

D

77

99

E

88

1212

F

88

1515

G

1212

2222

H

1515

2323

​Dave's latest start​ (LS) and latest finish​ (LF) are:

Activity	LS	LF
H	1515	2323

G

1313

2323

F

88

1515

E

99

1313

D

1313

1515

C

1010

1313

B

00

88

A

33

1010

The slack times​ are:

Activity	Slack
A	33

B

00

C

33

D

66

E

11

F

00

G

11

H

00

The activities on the critical path are

B - F - H

.

The total project completion time for Dave​ =

2323

weeks.

here