How important is a propper project to you? Scheduling the processes and managing those schedules is almost as important as propper preparation before the finishing is done. If the painter has already painted and signed a wall off, you do not want the electrician to cut a groove into that wall to lay a new cable. So too does it not help much if the ready-mix concrete trucks arrive on Monday and there is no one to lay the slab. Or the guys installing the swimming pool starts doing their thing while the plasterers are busy plastering the second story wall just above the pool.
These are rather obvious examples – let me assure you, it becomes a lot more fun in practice – but they happen every day, and that negligence (or blatant stupidity) costs enormous amounts of money. The more subtle examples are painters not waiting for the plaster to dry, or plasterers plastering in full sunlight, or ceilings being painted after the walls and floors have been finished off. A project manager is imperative.
