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CPM & PERT Schedule Development Flashcards

7 cards from real CST practice questions. Tap to flip, then mark Knew It or Still Learning — missed cards come back until you master them.

Read the first 7 CPM & PERT Schedule Development flashcards as text

  1. In a PERT network, the variance of the critical path is calculated by:

    Answer: Summing the variances of all activities on the critical path

    Path variance is the sum of individual activity variances along the critical path; variances (not standard deviations) are additive.

  2. A Finish-to-Finish (FF) relationship with a lag of 3 days between Activity X and Activity Y means:

    Answer: Y cannot finish until at least 3 days after X finishes

    An FF+3 relationship requires Y's finish to be at least 3 days after X's finish, delaying Y's completion.

  3. Which of the following is a correct statement about total float in a CPM network?

    Answer: Total float is shared by all activities on the same path and using it reduces float for other activities on that path

    Total float belongs to the path, not individual activities; consuming float on one activity reduces the available float for others on the same path.

  4. A scheduler is asked to calculate the probability of completing a project in 95 days when the PERT expected duration is 90 days and the critical path standard deviation is 5 days. What Z-score is used?

    Answer: Z = 1.0

    Z = (target − mean) / σ = (95 − 90) / 5 = 1.0, corresponding to approximately 84.1% probability.

  5. In CPM, the Late Start (LS) of an activity is calculated during the backward pass as:

    Answer: LS = LF − Duration

    Late Start equals Late Finish minus the activity duration, establishing the latest an activity can begin without delaying the project.

  6. Which condition defines a 'hammock activity' in a CPM schedule?

    Answer: An activity that connects two specific points in the schedule and derives its duration from the dates of those points

    A hammock activity's duration is not estimated independently; it is determined by the start of one activity and the finish of another, 'hanging' between them.

  7. When a CPM schedule is updated with actual progress, an activity that is 50% complete but has used 70% of its planned duration is exhibiting:

    Answer: A potential overrun — it is behind the planned rate of progress

    Completing only 50% of work while consuming 70% of duration signals that the activity is progressing slower than planned and may delay successors.