D1 June 2014 (R) Q6
6.
| Activity | Immediately preceding activities |
|---|---|
| A | – |
| B | – |
| C | – |
| D | A, C |
| E | B |
| F | E |
| G | A |
| H | D, F |
| I | D, F |
| J | H, I |
| Scheme | Marks |
|---|---|
| M1 (7 activities + 1 dummy) A1 (start + ABCE) A1 (DFG + 1st dummy) A1 (HIJ + 2nd dummy) A1cso |
Notes
In (i) condone lack of, or incorrect, numbered events throughout – also ‘dealt with correctly’ means that the activity starts from the correct event but not necessarily finishes at the correct event. Activity on node is M0.
Ignore incorrect or lack of arrows for the first four marks in (i) only.
1M1: 7 activities (labelled on arc) and one dummy placed.
1A1: One start + activities A, B, C and E dealt with correctly.
2A1: Activities D, F and G and the 1st dummy dealt with correctly.
3A1: Activities I, H and J and the 2nd dummy dealt with correctly.
4A1: CSO – all arrows present and correctly placed with one finish.
| Scheme | Marks |
|---|---|
| 1st dummy – G depends on A only, but D depends on A and C. | B1 |
| 2nd dummy – This is so that H and I will not share the same start and end events or so that H and I can be uniquely described in terms of their end events. | B1 |
| (7 marks) |
Notes
1B1: CAO - all relevant activities must be referred to – so activities D, G, A and C must all be mentioned for this mark
2B1: CAO – please note that e.g. ‘so that activities can be defined uniquely’ is not sufficient to earn this mark. There must be mention of describing activities uniquely in terms of the event at each end. However, give bod on statements that imply that an activity begins at ends at the same event.