The Professional Environmental Assessment Protocol was developed by a team of environment_aging researchers for the evaluation of specialized care environments for cognitively impaired elderly. Rather than more typical checklists of discrete environmental features, the PEAP requires an observer, with some training in its use, capable of making integrative judgments regarding 9 dimensions of the care environment. The 9 dimensions, deemed to be relevant to the creation of a therapeutic environment focus on safety and security, awareness and orientation, support of functional abilities, regulation of stimulation, opportunities for personal control, provision of privacy, facilitation of social contact, and continuity of the self. Data regarding the psychometric properties of the PEAP will be considered as well as its use in the facilitation of environmental change.