It may be said generally that this book intends to give a method rather than a doctrine, a technique of thinking which will help its possessor to draw correct conclusions in the field of Islamic Law. It cannot be forgotten that Shari’ah rules is dealing with all aspects of human existence. it is, therefore, a reality. The opportunity has been taken to furnish the book with more recent research on the subject. This provides factual material for the students to work upon. With this approach it is hoped that various group of readers should find this book a reliable and stimulating guide.