Quick Overview of Crystal Methods - Type of Agile Software Development

The Crystal methodology is one of the most lightweight, adaptable approaches to software development. Crystal is actually comprised of a family of methodologies (Crystal Clear, Crystal Yellow, Crystal Orange, etc.) whose unique characteristics are driven by several factors such as team size, system criticality, and project priorities. This Crystal family addresses the realization that each project may require a slightly tailored set of policies, practices, and processes in order to meet the project’s unique characteristics.

The use of the word "crystal" refers to the various facets of a gemstone — each a different face on an underlying core. The underlying core represents values and principles, while each facet represents a specific set of elements such as techniques, roles, tools, and standards. Cockburn also differentiates between methodology, techniques, and policies. A methodology is a set of elements (practices, tools); techniques are skill areas such as developing use cases; and policies dictate organizational "musts".