About the Book Symmetrical and Asymmetrical factorials and Main-effect plans contains critical explanations of factorial experiment with its different types. The main emphasis has been given to evolve a number of methods to get main-effect plans of symmetrical and asymmetrical factorials and of both orthogonal and non-orthogonal types. A number of new and yet unpublished results are there in this book. The description of different methods of construction of plans are given in simple explanation which requires general knowledge of Mathematics. New theories in each of the existing chapters have been made clear by giving suitable numerical examples. The proof of different theorems and algorithms are given in detail and therefore, it is expected to be of great help to graduate, post graduate students and research scholars. In different sections of each chapter, extension and proposed research works are indicated which will be helpful for the new researchers for doing advanced research.