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Calculating Float ActivityPrecedenceDuration Start0 D 4 A 6 FD, A7 ED8 GF, E5 BF5 HG7 CH8 EndC, B0 1. What is the duration of the critical path? A) 32 B) 33 C) 31 D) What is the float of activity B? A) 0 B) 16 C) 10 D) What is the float of Activity F? A) 0 B) 5 C) 13 D) 7 BEST VIEWED IN SLIDE SHOW MODE NOTE: This examples uses the day 0 method for the calculations. Starting the project on day 0 results in easier math.

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StartEnd AB CDE F GH X ESEF LSLF D F 1. Precedence Diagram 2. Durations 3. Forward Pass (ES EF) 4. Critical Path 5. Float of Critical Path Activities 6. Backward Pass (LF LS) QA Precedence Diagram Calculating Float BEST VIEWED IN SLIDE SHOW MODE

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StartEnd AB CDE F GH X ESEF LSLF D F 1. Precedence Diagram 2. Durations 3. Forward Pass (ES EF) 4. Critical Path 5. Float of Critical Path Activities 6. Backward Pass (LF LS) QA Calculating Float

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AB CDE F GH StartEnd QA X ESEF LSLF D F 1. Precedence Diagram 2. Durations 3. Forward Pass (ES EF) 4. Critical Path 5. Float of Critical Path Activities 6. Backward Pass (LF LS) Calculating Float

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A 0 B CD 0 E F GH StartEnd X ESEF LF D F 1. Precedence Diagram 2. Durations 3. Forward Pass (ES EF) 4. Critical Path 5. Float of Critical Path Activities 6. Backward Pass (LF LS) QA The latest Late Finish of the preceding activities determines Early Start = 6 Calculating Float

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A 06 6 B C D 04 4 E F G 18 5 H 25 7 StartEnd X ESEF LSLF D F 1. Precedence Diagram 2. Durations 3. Forward Pass (ES EF) 4. Critical Path 5. Float of Critical Path Activities 6. Backward Pass (LF LS) QA The latest Early Finish of the preceding activities determines Critical Path Calculating Float B

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A 06 6 B C D 04 4 E F G 18 5 H 25 7 StartEnd X ESEF LSLF D F 1. Precedence Diagram 2. Durations 3. Forward Pass (ES EF) 4. Critical Path 5. Float of Critical Path Activities 6. Backward Pass (LF LS) QA 1B Activities on the Critical Path have Zero Float Calculating Float A

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A 06 6 B C D 04 4 E F G 18 5 H 25 7 StartEnd X ESEF LSLF D F 1. Precedence Diagram 2. Durations 3. Forward Pass (ES EF) 4. Critical Path 5. Float of Critical Path Activities 6. Backward Pass (LF LS) QA 1B 2 3A Activities on the Critical Path have LS=ES and LF=EF Calculating Float

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A B C D 04 4 E F G H StartEnd QA 1B 2 3A X ESEF LSLF D F 1. Precedence Diagram 2. Durations 3. Forward Pass (ES EF) 4. Critical Path 5. Float of Critical Path Activities 6. Backward Pass (LF LS) The earliest Late Start of the following activities determines Late Finish 33 – 5 = – 13 = Calculating Float D

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A B C D E F G H StartEnd X ESEF LSLF D F 1. Precedence Diagram 2. Durations 3. Forward Pass (ES EF) 4. Critical Path 5. Float of Critical Path Activities 6. Backward Pass (LF LS) QA 1B 2D 3A Calculating Float What else can we learn from this example?

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A B C D E F G H StartEnd X ESEF LSLF D F 1. Precedence Diagram 2. Durations 3. Forward Pass (ES EF) 4. Critical Path 5. Float of Critical Path Activities 6. Backward Pass (LF LS) QA 1B 2D 3A 11 Project has increased RISK because of a Near-Critical Path Calculating Float

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