Some tasks look as if they can be done at any point, yet their order decides whether something has to be torn out later.
On a project that runs smoothly, the sequence of works looks trivial. On a project in trouble, that sequence is usually the cause.
Electrical and plumbing are the most common example. Pipe and cable routes must be settled before walls are plastered. Moving a socket or a light point after the walls are smooth means chasing, re-embedding, then repairing the plaster. Work that should have been done once is done three times.
Ceilings and lighting go together as well. The type of fitting determines the depth of the ceiling frame. Deciding on recessed lights after the frame is up often means lowering it, which costs room height.
In exterior work, landscaping should come after the heavy work is finished. A garden laid out first will be driven over by trucks, walked on by workers and buried under leftover material. Redoing it afterwards is a cost that could have been avoided entirely.
In Bali there is an additional consideration. Building a merajan and other sacred elements generally follows auspicious dates. That is not an obstacle, but it has to be in the schedule from the start so it does not collide with other planned work.
The rainy season matters too. Roofing and exterior painting depend heavily on the weather. Scheduling both at the height of the rains means accepting a delay that could have been foreseen.
A good sequence does not make a project finish sooner than it should. What it does is stop the same work being done twice.