| Exam Board | OCR |
|---|---|
| Module | FD1 AS (Further Decision 1 AS) |
| Year | 2017 |
| Session | December |
| Marks | 8 |
| Topic | Critical Path Analysis |
| Type | Find range for variable duration |
| Difficulty | Standard +0.3 This is a standard critical path analysis question requiring forward/backward passes and float calculations (routine D1 techniques), followed by finding when an activity becomes critical by solving an inequality. While multi-step, it involves straightforward algorithmic procedures with no novel insight required, making it slightly easier than average. |
| Spec | 7.05a Critical path analysis: activity on arc networks7.05b Forward and backward pass: earliest/latest times, critical activities |
| Answer | Marks | Guidance |
|---|---|---|
| 3 | 0 | 2 |
Question 3:
3 | 0 | 2 | 2.5 | 23 The activities involved in a project and their durations are represented in the activity network below.\\
\includegraphics[max width=\textwidth, alt={}, center]{a7bca340-6947-42b5-bc35-e6d429d6bed7-3_494_700_306_683}\\
(i) Carry out a forward pass and a backward pass through the network.\\
(ii) Find the float for each activity.
A delay means that the duration of activity E increases to $x$.\\
(iii) Find the values of $x$ for which activity E is not a critical activity.
\hfill \mbox{\textit{OCR FD1 AS 2017 Q3 [8]}}