Contextualizing Measurement: Establishing a Construct and Content Foundation for the Assessment of Cancer-Related Dyadic Efficacy.

This paper illustrates a rigorous approach to the initial phases of scale development when evaluating an existing construct, dyadic efficacy, in a new population. Cancer-related dyadic efficacy represents a couples' confidence in their conjoint abilities to manage the effects of cancer. Two samples of individuals diagnosed with cancer and their partners, along with a professional panel, contributed lay and content expertise, respectively. Thematic analysis was used to describe cancer-related dyadic efficacy and identify content domains. Cancer-related dyadic efficacy was conceptualized as multidimensional, consistent with relational functioning, and distinct from self-efficacy. A pool of 50 items was developed to assess eight content domains grouped into three main themes: dyadic efficacy for managing (a) illness intrusions, (b) emotional responses and (c) communication and care for children. This paper responds to calls for more rigorous reporting of the qualitative procedures required to establish a conceptual grounding for a new scale.