He is author of the book, Computers in Education , published in Great Britain by Floris Books. You will find a pointer to the original version on his home page .
Computers are abstract machines that transform data.
They are, in fact, thoughts. The same applies to programs, which are also pieces of data. What the computer does when it interprets a program is to simulate exactly the thoughts we had when we inserted them into the program. Given a program and input data, we can simulate the computer's interpretation mentally or with pencil and paper. Computers cannot be used as transportation devices, their result cannot be used as food or clothing, they do not produce anything real.