These booklets introduce the basics of the Unicist Theory and its main applications. The Unicist Theory made adaptive systems manageable and gave an epistemological structure to complexity sciences. As it is known, the management of complexity has been an unsolved challenge for sciences. This challenge has been faced in 1976 by the author at The Unicist Research Institute, developing concrete solutions to manage the complex adaptive systems by using a logical approach based on the Unicist Theory.