Calculating Float Activity BEST VIEWED IN SLIDE SHOW

Calculating Float Activity BEST VIEWED IN SLIDE SHOW MODE 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 NOTE: This examples uses the “day 0” method for the calculations. Starting the project on day 0 results in easier math. www. qvive. biz 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

Calculating Float Start “A” “F” “B” “D” “E” “G” ES D EF “X” LS F LF www. qvive. biz BEST VIEWED IN SLIDE SHOW MODE End “H” 1. Precedence Diagram 2. Durations 3. Forward Pass (ES EF) 4. Critical Path 5. Float of Critical Path Activities 6. Backward Pass (LF LS) “C” Q 1 2 3 A

Calculating Float Start “A” “F” “B” “D” “E” “G” ES D EF “X” LS F LF www. qvive. biz End “H” 1. Precedence Diagram 2. Durations 3. Forward Pass (ES EF) 4. Critical Path 5. Float of Critical Path Activities 6. Backward Pass (LF LS) “C” Q 1 2 3 A

Calculating Float Start 6 7 5 “A” “F” “B” 4 8 5 7 8 “D” “E” “G” “H” “C” ES D EF “X” LS F LF www. qvive. biz End 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 1 2 3 A

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

Calculating Float 0 Start 6 6 6 “A” 0 4 7 13 13 “F” 4 4 “D” 8 “E” 5 18 End “B” 12 13 5 “G” 18 18 7 “H” 25 8 25 33 “C” The latest Early Finish of the preceding activities determines Critical Path ES D EF “X” LS F LF www. qvive. biz 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

Calculating Float 0 Start 0 6 6 6 7 “A” “F” 0 0 4 4 4 “D” 8 “E” 13 13 5 18 End “B” 12 13 5 18 18 7 25 8 25 33 “G” “H” “C” 0 0 0 Activities on the Critical Path have Zero Float ES D EF “X” LS F LF www. qvive. biz 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

Calculating Float 0 Start 6 6 6 “A” 7 13 13 “F” 18 End “B” 0 0 6 6 0 13 0 4 4 4 8 12 “D” 5 13 “E” 5 18 18 “G” 13 0 7 25 “H” 18 18 0 8 25 33 “C” 25 25 0 33 Activities on the Critical Path have LS=ES and LF=EF ES D EF “X” LS F LF www. qvive. biz 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

Calculating Float 0 Start 6 6 6 “A” 7 13 13 “F” 5 18 End “B” 0 0 6 6 0 13 28 15 33 0 4 4 4 8 12 13 “D” 1 1 “E” 5 5 18 33 – 5 = 28 28 – 13 = 15 18 “G” 13 13 0 7 25 “H” 18 18 0 8 25 33 “C” 25 25 0 33 The earliest Late Start of the following activities determines Late Finish ES D EF “X” LS F LF www. qvive. biz 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 0 Start 6 6 6 “A” 7 13 13 “F” 5 18 End “B” 0 0 6 6 0 13 28 15 33 0 4 4 4 8 12 13 “D” 1 1 “E” 5 5 18 18 “G” 13 13 0 7 25 “H” 18 18 0 8 25 33 “C” 25 25 0 33 What else can we learn from this example? ES D EF “X” LS F LF www. qvive. biz 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 0 Start 6 6 6 “A” 7 13 13 “F” 5 18 End “B” 0 0 6 6 0 13 28 15 33 0 4 4 4 8 12 13 “D” 1 1 “E” 5 5 18 18 “G” 13 13 0 7 25 “H” 18 18 0 8 25 33 “C” 25 25 0 33 Project has increased RISK because of a Near-Critical Path ES D EF “X” LS F LF www. qvive. biz 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