This book and the symposium on which it was based were designed to cross the boundaries of subdiscipline and theoretical orientation to address four critical issues in understanding development: explanation of change and development; the nature and process of change; forms of variability in performance; and the promotion of change through application.The chapters suggest that change and development in target systems from cells to selves, may not be explainable, assessable, or promotable without careful reference to the context (social and otherwise) of the system, and that the process of change and development may involve variability of the system in addition to periods of stability. Together the chapters harken back to the spirit of the grand theory.Instead of proposing a grand theory, they provide an excellent foundation for considering the importance of an individual's (or particular group's) context and variability, and discussions to facilitate thinking about what still needs to be worked out.