Measuring characteristics of individuals: An updated systematic review of instruments' psychometric properties.

. Our review showed that many measures exist for certain constructs (e.g., measures related to assessing providers' attitudes and perceptions about evidence-based practice interventions), while others have very few (e.g., an individual's stage of change). Also, we rated measures for their psychometric strength utilizing an anchored rating system and found that most measures assessing individual characteristics are in need of more research to establish their evidence of quality. It was also clear from our results that frequency of use/citations does not equate to high quality, psychometric strength. Ultimately, the state of the literature has demonstrated that assessing individual characteristics of implementation stakeholders is an area of strong interest in implementation work. It will be important for future research to focus on clearly delineating the psychometric properties of existing measures for saturated constructs, while for the others the emphasis should be on developing new, high-quality measures and make these available to stakeholders.