recently I encountered Exercises in operation management. how to decide predecessors in it, is it correct?

Based on the activities listed in the table below. The Project began with activR. Inspection activity for the project estimate to be held after completed all building accities A and end with activity S. Activities J is precedence of A. Activities K, L and B should continue only when activity J completed. Application for approval only can be done soonest activities M and C accomplished. Activity of concrete pour & curing process only applicable when activities N and G completed. Activities E and F propose to execute at the same time. Complete of E and F activities, then only execute activity omplishments.


Activities Predecessor
A Conversation with master pool build with -
industry experience for expert opinions J
J Site visit from an experience consultant A
K Pool design J
L Detailed proposal kit & design presentation J
B Fine tune pool design J
I Sign contract & pay deposit -
M Structural works H
C architectural engineering H
H Submit application to local council for approval -
N Excavation & safety fencing for work in progress O
G Formwork, steel fixing & plumping in shell O
O Concrete pour & curing process -
D Electrical, equipment & fencing permanents -
P Prepare surface & interior lining -
Q Compliance inspection -
E Final clean and touch up R
F Fill with water, balance by testing R
R Handover package to management & ready to operate -
S Defects with warranty & after sales service -