1.4. Table 2 illustrates proposed schedule for the design phase of the project. Table 2: The label, description, duration and predecessor(s) of activities that inform the database design. Activity label Activity description Predecessor Optimistic (a) Most likely (m) Pessimistic (b) A Analyse architecture design model - 2.2 3 3.5 B Create conceptual design A 5 6 6.5 C Create logical design B 8.5 9 9.5 D Assess database management systems and skills B 1 3 4 E Assess server-side scripting languages and skills B 1 2.5 3 F Select language and assign programmers E 1 2.5 3 G Select database management system and assign programmers D 1 2.5 3 H Create physical database system C, H, G 66 66.5 67

1.4.1.Calculate the expected duration (te) for activity A. (1)

1.4.2.Calculate the expected duration (te) for activity B.

1.4.3.Calculate the expected duration (te) for activity C.

1.4.4.Calculate the expected duration (te) for activity D.

4.5.Calculate the expected duration (te) for activity H.