It's what happens when there are many contractors involved, each intertwined in a complex relationship, each needing to schedule around each other and each with half a dozen sub contractors under them with the same complex requirements.

So 200 square ft of tile takes three months because the tilers are hired by the tiling company who is hired by the contractor hired to finish the walls who was hired by the main contractor who was hired by the construction company. Along this long chain someone schedules tiling on the same day the electricians are wiring up the lights. They reschedule and crew arrives only to find the materials are missing, no one knows who ordered them or who to talk to. Once they sort that out and get the materials delivered the project is put on hold because someone stubbed their toe on a box of tiles and a stop work order is issued. A safety inspector arrives with the cast of CSI miami to figure out who to blame. Meanwhile, while everyone is busy blaming each other, the tiling contractor steals the materials for another job and everything goes right back to square one. Now multiply this story by the number of individual items to be coordinated... All this while, the crew has to be paid for their time even though they couldn't work. Absolute madness.