James N (The Aerospace Corporation, Chantilly, Virginia, USA) Martin 
Systems Engineering Guidebook [PDF ebook] 
A Process for Developing Systems and Products

Systems Engineering Guidebook: A Process for Developing Systems and Products is intended to provide readers with a guide to understanding and becoming familiar with the systems engineering process, its application, and its value to the successful implementation of systems development projects. The book describes the systems engineering process as a multidisciplinary effort. The process is defined in terms of specific tasks to be accomplished, with great emphasis placed on defining the problem that is being addressed prior to designing the solution.