The basic principles of making a pattern outline are demonstrated in this file. Certain rules are constant and never vary when making a flat-pattern outline. Defining a method of construction is essential for obtaining an organized approach to pattern-making projects and a simple and direct reading of outlines. These basic principles are valid for making an outline and for transforming one. Respecting the fundamentals will lead to qualitative pattern-making that is easy to understand and follow. These rules, which are valid for all the womenswear outlines illustrated in the three volumes, will also allow a third person to read the various elements comprised in each outline without any difficulty.