I was just able to give you an example of how to do these with Lags. Hope it helps.

Forward Pass: Earliest Times

ES = Early Start EF = Early Finish

Backward Pass: Latest Times

LS = Late Start LF = Late Finish

SL = Slack or Float --> How long can the activity be delayed.

Use of Lags- Combination Networks Using Lags More than one lag relationship can be attached to an activity These relationships are usually start-to-start and finish-to- finish combinations 12 Syster 0 510 17 20 12 E 18 Example debug cannot begin until 2 days after Lag 2 coding has started. Coding must be finished 4 days before debug can be finished 16 218 110 10 D 10 Lag 3 Lag4 Lag 4 Code 10 10 16 Legend ID EL Daneription EL Lag 2 Debug LAG 10 LAG 8 LAG LAG 2 8 4 LAG 4 LEGEND ES IDE LAG 10 LAG 8 LS DU L 9 4 Use of Lags- Combination Networks Using Lags More than one lag relationship can be attached to an activity These relationships are usually start-to-start and finish-to- finish combinations 12 Syster 0 510 17 20 12 E 18 Example debug cannot begin until 2 days after Lag 2 coding has started. Coding must be finished 4 days before debug can be finished 16 218 110 10 D 10 Lag 3 Lag4 Lag 4 Code 10 10 16 Legend ID EL Daneription EL Lag 2 Debug LAG 10 LAG 8 LAG LAG 2 8 4 LAG 4 LEGEND ES IDE LAG 10 LAG 8 LS DU L 9 4