The core concepts and general concepts discussed in Parts One and Two of this book were originally one long alphabetical list. For reasons of speedier access, however, I decided to move four core concepts and processes—needs assessment, instructional systems design, evaluation, and systems—to the front, as Part One. These are the top four concepts that most practitioners have to deal with on a daily basis, so it's handy to have them in a separate section. Taken together, however, Parts One and Two can actually be viewed as a single list of concepts, processes, and terms. Frequent cross-references throughout the book help facilitate jumps to relevant and related information.