Having a schedule is really important. Even if you have to revise it now and again because a chapter section took longer than you thought or your data didn’t come in when expected, a schedule helps you maintain your perspective as the writer of a whole dissertation.
For some writers, simply creating a list of chapters and then nesting within that list small steps toward completion of each chapter is enough. But if that doesn’t work for you, or if you’re struggling to create a writing schedule, here are some resources.