An increasing number of international, national and industry standards describe process models. These models are developed for a range of purposes including process implementation and assessment. The terms and descriptions used in such models vary in format, content and level of prescription. ISO/IEC TR 24774:2007 presents guidelines for the elements used most frequently in describing a process: the title, purpose statement, outcomes, activities and tasks. Whilst the primary purpose of ISO/IEC TR 24774:2007 is to encourage consistency in standard process reference models, the guidelines it provides may be applied to any process model developed for any purpose.