This book addresses core recommendations by the Conference Board of the Mathematical Sciences -- an umbrella organisation consisting of sixteen professional societies in the United States-regarding the mathematical preparation of the teachers. According to the Board, the concept of a capstone course in a mathematics education program includes teachers' learning to use commonly available educational software with the goal to reach a certain depth of the mathematics curriculum through appropriately designed computational experiments. In turn, the notion of experiment in the teaching of mathematics sets up a path toward enhancing the "E" component of the teachers' literacy in the STEM disciplines. This book discusses experiences in teaching a computer-enhanced capstone course for prospective teachers of high school mathematics.