True, but it is somewhat more complicated than that, the process in general is linear but you want to keep your workers occupied and not waiting for something,

True, but it is somewhat more complicated than that, the process in general is linear but you want to keep your workers occupied and not waiting for something, especially the specialist- drywalls can be built, the electrician can start working and plumbers connect things as soon as the first floor is up, but they need to bring equipment and workers to the site so they are usually called a little late to be more efficient and work continuously. But generally speaking a building project gantt chart is relatively flat.