A few points must be cleared up before we begin to explore the main aspects of Prolog.
These notes are supplemented with exercises and suggestions for simple practicals. It is assumed that you will do most of this supplementary work either in your own time, for tutorials or during practical sessions.
Each chapter will start with a simple outline of its content and finish with a brief description of what you should know upon completion of the chapter and its exercises.
Important points will be 
and some
technical and practical details which are
not immediately essential to the exposition will be
written in a smaller font.