Calculating Float

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Calculating Float : Calculating Float Activity Precedence Duration Start 0 D Start 4 A Start 6 F D, A 7 E D 8 G F, E 5 B F 5 H G 7 C H 8 End C, B 0 1. What is the duration of the critical path? A) 32 B) 33 C) 31 D) 35 2. What is the float of activity B? A) 0 B) 16 C) 10 D) 15 3. What is the float of Activity F? A) 0 B) 5 C) 13 D) 7 BEST VIEWED IN SLIDE SHOW MODE www.qvive.biz

PowerPoint Presentation : Start End “A” “B” “C” “D” “E” “F” “G” “H” “X” ES EF LS 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) Q A 1 2 3 1. Precedence Diagram Calculating Float BEST VIEWED IN SLIDE SHOW MODE

PowerPoint Presentation : “A” “B” “C” “D” “E” “F” “G” “H” Start End Q A 1 2 3 6 5 8 4 8 7 5 7 “X” ES EF LS 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) Calculating Float

PowerPoint Presentation : “A” 0 “B” “C” “D” 0 “E” “F” “G” “H” Start End “X” ES EF 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) Q A 1 2 3 6 5 8 4 8 7 5 7 6 4 6 13 4 12 13 18 25 33 13 18 18 25 The latest Late Finish of the preceding activities determines Early Start 6 4 13 12 0 + 6 = 6 Calculating Float

PowerPoint Presentation : “A” 0 6 6 “B” 13 18 5 “C” 25 33 8 “D” 0 4 4 “E” 4 12 8 “F” 6 13 7 “G” 13 18 5 “H” 18 25 7 Start End “X” ES EF LS 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) Q A 1 2 3 The latest Early Finish of the preceding activities determines Critical Path 12 13 18 33 6 4 Calculating Float B

PowerPoint Presentation : “A” 0 6 6 “B” 13 18 5 “C” 25 33 8 “D” 0 4 4 “E” 4 12 8 “F” 6 13 7 “G” 13 18 5 “H” 18 25 7 Start End “X” ES EF LS 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) Q A 1 B 2 3 0 0 0 0 0 Activities on the Critical Path have Zero Float Calculating Float A

PowerPoint Presentation : “A” 0 6 6 “B” 13 18 5 “C” 25 33 8 “D” 0 4 4 “E” 4 12 8 “F” 6 13 7 “G” 13 18 5 “H” 18 25 7 Start End “X” ES EF LS 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) Q A 1 B 2 3 A 0 0 0 0 0 0 6 25 33 6 13 13 18 18 25 Activities on the Critical Path have LS=ES and LF=EF Calculating Float

PowerPoint Presentation : “A” 0 6 0 6 6 0 “B” 13 18 5 “C” 25 33 25 33 8 0 “D” 0 4 4 “E” 4 12 8 “F” 6 13 6 13 7 0 “G” 13 18 13 18 5 0 “H” 18 25 18 25 7 0 Start End Q A 1 B 2 3 A 33 28 1 5 5 13 15 1 1 “X” ES EF LS 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) The earliest Late Start of the following activities determines Late Finish 33 – 5 = 28 28 – 13 = 15 6 5 Calculating Float D

PowerPoint Presentation : “A” 0 6 0 6 6 0 “B” 13 18 28 33 5 15 “C” 25 33 25 33 8 0 “D” 0 4 1 5 4 1 “E” 4 12 5 13 8 1 “F” 6 13 6 13 7 0 “G” 13 18 13 18 5 0 “H” 18 25 18 25 7 0 Start End “X” ES EF LS 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) Q A 1 B 2 D 3 A Calculating Float What else can we learn from this example?

PowerPoint Presentation : “A” 0 6 0 6 6 0 “B” 13 18 28 33 5 15 “C” 25 33 25 33 8 0 “D” 0 4 1 5 4 1 “E” 4 12 5 13 8 1 “F” 6 13 6 13 7 0 “G” 13 18 13 18 5 0 “H” 18 25 18 25 7 0 Start End “X” ES EF LS 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) Q A 1 B 2 D 3 A 1 1 Project has increased RISK because of a Near-Critical Path Calculating Float