Full module assessment covering all twelve lessons: project networks, precedence tables, AOA diagrams, forward and backward scans, critical paths, float, Gantt charts, multiple critical paths, constraints, crashing, and cost-time trade-offs.
Multiple Choice
15 questions drawn from the full module bank — feedback shown immediately
Short Answer
1. A construction project has: Site prep(4,-), Foundation(6,Site prep), Framing(8,Foundation), Roofing(5,Framing), Plumbing(4,Framing), Electrical(3,Framing), Drywall(6,Plumbing+Electrical), Painting(4,Drywall+Roofing). (a) Build the precedence table. (b) Draw the AOA network. (c) Perform forward and backward scans. (d) Find the critical path and project duration. (e) Calculate float for all non-critical activities. (f) Draw a Gantt chart. 8 MARKS
2. Using the project from Q1: (a) Framing can be crashed from 8 to 6 days at $500/day. Drywall from 6 to 4 at $400/day. Reduce duration by 2 days at minimum cost. Show working. (2 marks) (b) A resource constraint means only 2 trades can work simultaneously during Framing, Plumbing, and Electrical. All three need to start after Framing. How does this affect the schedule? (2 marks) (c) Explain why reducing Framing by 2 days might not reduce the project by 2 days if Plumbing and Drywall are also shortened. (2 marks) 6 MARKS
3. (a) Prove that the critical path is the longest path through the network. (3 marks) (b) A project has normal cost $20,000 and duration 25 days. Indirect costs are $600/day. Two critical activities can be crashed: X (normal 10, crash 7, +$1500) and Y (normal 8, crash 6, +$1200). Find the optimal duration and minimum total cost. Show all working. (4 marks) (c) Evaluate the statement: "Crashing is always worth it if the indirect cost per day exceeds the crash cost per day." (3 marks) 10 MARKS
(a) Table correct [1].
(b) Network with dummies if needed [1.5].
(c) Forward and backward scans [2].
(d) Critical path and duration = 32 [1].
(e) Floats: Roofing=5, Electrical=1 [1.5].
(f) Gantt chart [1].
(a) Crash plan and cost [2].
(b) Schedule analysis [2].
(c) Explanation [2].
(a) Proof [3].
(b) Optimal duration and cost [4].
(c) Evaluation [3].
Tick when you have finished all questions and checked your answers.