A PhD thesis is a large piece of writing which compiles several years of research. As such, it needs a great amount of planning not only at the beginning but also during the writing process itself where thoughts might move to another section several times.
My PhD is in the field of nanophysic, exploring the possibility that single molecules could be used as the building blocks of new kinds of microprocessors. My work is based on numerical simulations that run on supercomputers where performance really matters, which could explain my obsession with finding the right tool for a given task.