Understanding complexity in psychological services: A modified Delphi study.

Rationale, Aims And Objectives: The concept of patient or case complexity is relevant-and widely used-at all levels and stages of mental health service provision, but there have been few methodologically robust attempts to define this term. This study aimed to establish a consensus on factors contributing to patient complexity in adult psychological services using Delphi methodology.

Method: Applied psychologists in a single urban/suburban UK National Health Service setting took part in a three-round modified Delphi study.