The interpretation of change in verbal reports: Implications for health psychology

Abstract

This paper raises a number of issues for health psychology in relation to the interpretation of change in verbal reports. Drawing on a typology of change developed to evaluate organisational interventions, it is suggested that change may occur at an alpha level (e.g. changed health status), beta level (e.g. a recalibration of the respondent's scale for assessing health status) or gamma level (e.g. a reconceptualisation of the meaning attached to health). Given the likely presence of beta and/or gamma change in intervention data in health psychology, researchers may be analysing their change data at an inappropriate level. A number of existing methodologies which attempt to detect beta and gamma change are presented and discussed. The need to develop further methodologies which focus more explicitly on the nature of change is highlighted. Finally, the proposed typology has a number of practical implications for the design of health promotion interventions.