Refer to Table 3 and Appendix 1:

Mark scheme

Marking points from the official mark scheme (May/June 2020). The mark or mark type is shown in brackets.

1. [4] (a)(i) Node 3: EST = 5 (1 mark) LFT = 5 (1 mark) Node 4: EST = 6 (1 mark) LFT = 18 (1 mark)
2. [1] (a)(ii) ACDEG (1 mark)
3. [1] (a)(iii) 20 weeks (1 mark)
4. [2] (a)(iv) Total float = LFT – duration – EST (1 mark) Or LST – EST (1 mark) 17-2-9=6 weeks (2 marks)
5. [Knowledge] (b) Definition of network analysis: this is part of project management to ensure that resources are used efficiently. Also known as critical path analysis it identifies all tasks in a project, puts them in the correct sequence and allows for the identification of the critical path - fastest route to completion.
6. [Analysis] (b) Planning of when resources are needed and their use can save time and money
7. [Analysis] (b) Sets target to work towards
8. [Analysis] (b) Construction of network diagram forces managers to plan project carefully
9. [Analysis] (b) Identifies critical activities for management to focus on
10. [Analysis] (b) Fixtures and fittings can be ordered to arrive just in time for their installation in week 18 so cash outflows can be delayed.
11. [Analysis] (b) Targets set will help motivate staff and increase efficiency
12. [Application] (b) Reference to activities in Table 3
13. [Application] (b) Reference to total float / free float of individual activities
14. [Application] (b) Reference to three spare weeks to complete project before the 23 week deadline
15. [Evaluation] (b) Will need to be supported by other techniques such as Gantt charts to manage resources effectively
16. [Evaluation] (b) Network presented is relatively simplistic – more detail needed
17. [Evaluation] (b) Doesn't guarantee that project will be completed on time
18. [Evaluation] (b) HBG has experience of planning building work so should be relatively accurate