Object: Witches. Setting: 16th/17th century Europe, the height of the witch persecutions. Context: Rationality. How it is irrational to believe in witchcraft now, yet it was perfectly rational just a few hundred years ago. Aim: The aim of my project is to investigate the concept of the progressiveness of rationality; whether we can ever say that our rationality, and what is logical, is getting more sophisticated, and more correspondent to the truth. Whether we can say that our current denial of the physical reality of witchcraft is more superior to the 16th century affirmation of it. Method: In my project, I have first examined the ‘witch craze’ in detail, considering some significant points it highlights on the concept of progressive rationality. I have then examined philosophical opinions to support my findings. Philosophers: The main philosophers I have used are Kuhn and Foucault, who do not think a linear progression of rationality is possible. I have also looked at Lyotard and Kant, who do think progression occurs.