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Standards of Practice Course

Standards of Practice Course. CPM Scheduling Lab. Activity ID. Early Start. Early Finish. ES. ID. EF. Late Start. LS. D. LF. Late Finish. FF. TF. Free Float. Total Float. Duration. Activity Notation. Use for Manual Calculation. April, 2010. Sample. Notation:. ES. ID. EF.

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Standards of Practice Course

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  1. Standards of Practice Course CPM Scheduling Lab

  2. Activity ID Early Start Early Finish ES ID EF Late Start LS D LF Late Finish FF TF Free Float Total Float Duration Activity Notation Use for Manual Calculation April, 2010

  3. Sample Notation: ES ID EF LF LS D FF TF • ES = EFP + 1 Subscripts: S = Successor P = Predecessor 4 B 4 7 1 7 • EF = ES + D - 1 3 3 1 A 3 8 D 17 FS FS 1 3 3 • LS = LF - D + 1 8 10 17 0 0 0 0 4 C 7 • FF = ESS - EF - 1 4 4 7 • TF = LF - EF 0 0 • LF = LSS - 1 April, 2010 September, 2006

  4. CMAA Formulas for Calculationfor Finish-to-Start Activities • ES = EFP + 1 • LS = LF - D + 1 • TF = LF - EF • EF = ES + D – 1 • LF = LSS – 1 • FF = ESS - EF - 1 April, 2010 September, 2006

  5. CMAA Calculation Tips Start by taking note of the relationships. Notice which are not finish-start, or which ones are finish-start but with a lag. (Formulas don’t apply to Start-to-Start relationships or Finish-to-Finish relationships.) Begin calculating on the first activity on the left side. In CMAA’s examples, the first activity begins on Day One. Not Day Zero. Work towards the right, in an up and down motion, in strips (this is to avoid unnecessary iterations). April, 2010 September, 2006

  6. CMAA Calculation Tips When working with a lag greater than 0, first calculate the link as if it had no lag. Then add the lag time. When an activity has multiple predecessors, each predecessor must be evaluated in turn to determine the correct early start date for the successor. During the Forward pass, the greater # (latest date) overrides. The same concept holds true during the backward pass. For activities which have multiple successors, each successor must be evaluated to determine the correct late finish date for the preceding activity. During the backward pass, the lesser # (earlier date) overrides. The last activity has no successor, so the late date formulas don’t apply. Assume for the last activity, EF = LF = END. April, 2010 September, 2006

  7. Exercise #1 Notation: ES ID EF LF LS D FF TF • ES = EFP + 1 Subscripts: S = Successor P = Predecessor 4 B 1 • EF = ES + D - 1 1 A 3 D FS FS 3 • LS = LF - D + 1 10 C • FF = ESS - EF - 1 4 • TF = LF - EF • LF = LSS - 1 April, 2010 September, 2006

  8. Exercise #2, Part 1 PART 1: Calculate a Baseline Schedule The AON logical network of a baseline schedule for a construction project is as shown in Exercise #2. Assume that for the last activity EF=LF=end of project. Required: Answer all questions on network diagram only Calculate the ES, EF, LS, LF, and TF for each activity. What is the free float (FF) for activity E? What is the free float (FF) for activity F? Explain the difference in days between the FF and the TF for activity F. April, 2010 September, 2006

  9. Exercise #2, Part 1 Notation: ES ID EF LF LS D FF TF • All relationships finish-start unless noted. B C FS - 2 10 10 A D E H FS + 2 10 5 5 5 F G SS + 5 10 10 April, 2010 September, 2006

  10. Exercise #2, Forward Path A B FS - 2 C FS+ 2 D E SS + 5 F G H April, 2010 September, 2006

  11. Exercise #2, Backward Path A B FS - 2 C FS + 2 D E SS + 5 F G H April, 2010 September, 2006

  12. Exercise #2, Part 2 PART 2: Calculating Progress on the Schedule At the end of the day on day 15, the following progress information was available: • Activity A started 2 days late, and was completed on time. • Activity B started on time, and made progress as follows. • Completed work in place = 500 sq ft • Remaining work quantity = 500 sq ft April, 2010 September, 2006

  13. Exercise #2, Part 2 PART 2,Continued: Activity D started on day 14. Remaining duration required for completion is estimated to be 2 days. The original duration for Activity E changed from 5 days to 20 days. April, 2010 September, 2006

  14. Exercise #2, Part 2 PART 2, Continued: Required: Answer all questions on network diagram only Based on the progress information available at end of day 15, • Q1. Calculate actual start and finish dates for all activities in progress. • Q2. Calculate the ES, EF, LS, LF, and TF for all other activities. Identify the critical Path. April, 2010 September, 2006

  15. Exercise #2, Part 2 Notation: Actual Start AS AF AD Actual Duration ES ID EF LF LS D Actual Finish • All relationships finish-start unless noted. FF TF Dur = RD if AD>0 Dur = RD if AD=0 (activity has not started) B C FS - 2 10 10 A D E H FS + 2 10 5 20 5 F G SS + 5 10 10 April, 2010 September, 2006

  16. Exercise #2, Forward Path Data Date – Day 16 A B FS - 2 FS + 2 C D E SS + 5 F G H April, 2010 September, 2006

  17. Exercise #2, Backward Path Data Date – Day 16 A B FS - 2 FS + 2 C D E SS + 5 F G H April, 2010 September, 2006

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