As the following indicates, there is a lot involved in cooking a meal. A man has to cook a meal for his friends. The meal has to be ready at 7 p.m. The shopping still has to be done. There are three courses: soup, main course, dessert. The main course consists of potatoes, vegetables and steak.

A table of activities (Table 4.12) is shown hereafter.

a Make a network diagram based on this table of activities. Which of the activities are on the critical path?
b What is the duration of this ‘project’?
c Make a Gantt chart based on the network diagram.
d Because the potato peeler cannot be found, a new one has to be bought.
This means that activity D lasts 90 minutes instead of 7 minutes. What will the duration be now? Use the network diagram.

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TABLE 4.12 Table of activities belonging to assignment 4.8 Activity Minutes Only after: A Shopping B Make stock 60 C Wash vegetables 663 60 A A D Peel potatoes 7 A E Make soup 30 B, C F Boil vegetables 20 C GH Boil potatoes 20 D Grill meat 15 I Make dessert 10 J Eat soup 10 A A E K Eat main course 10 F, G, H, J L Eat dessert 5 I, K