This issue of the Australian Occupational Therapy Journal (AOTJ) features original research related to measurement and the psychometric evaluation of measures used in occupational therapy practice and research. Informative and accurate measurement during the assessment, goal setting, intervention and follow‐up phases of occupational therapy service provision is a key component of both evidence‐based and client‐centred practice. Collaborative practice with clients, families, organisations and other professionals relies on sound assessment tools. Measurement is a core aspect of all specialities and clinical settings within the field of occupational therapy. Justification for and validation of occupational therapy interventions can only be achieved through measurement of effective and meaningful change. Therefore, measures must be valid, reliable, clinically relevant, culturally appropriate, easy to use and occupation‐focussed.