writing the introduction

Writing the introduction to a book (because that is what my thesis is in the end) is one of the most difficult tasks you can have, because it means for you to have the general picture of your study and a good idea on how to trace it there. I wrote the draft of the intro to my thesis in a few days and I think I do have a general view of my thesis, but I keep going back to it with changes and doubts. I have a feeling it is going to be a long process...