Miss Jacky invited Mr. David to quote the price and duration for the construction of a 12m²garden office in her backyard. Mr. David expressed his interest to do the job and told Miss Trinity that he would work out the time and cost estimates for the garden office construction.

Below are the activity time estimates and dependencies that Mr. David planned for the garden office construction:

ID Description Predecessor Time (Days) A Site clearance None 1 B Install office's timber base A 1 C Floor insulation A 1 D Timber floorboard installation A 1 E Frame B,C,D 2 F Wall+protection wrap E 3 G External wall cladding F 7 H Door & window opening F 1 | Install roofing F 3 J Wall + ceiling insulation F,I 3 K Electrical works (wiring and lighting) I,J 3 L Ceiling board J 1 Install aluminium bi-fold door and M windows ZZOP N Internal wall finishes (plaster and paint) Carpet Install external decking Q Clean-up H,I 1 I,J,K 4 M,N 1 G 2 P,O,L 1