title: Measuring determinants of implementation behavior: psychometric properties of a questionnaire based on the theoretical domains framework.
abstract: BACKGROUND
  To be able to design effective strategies to improve healthcare professionals' implementation behaviors, a valid and reliable questionnaire is needed to assess potential implementation determinants. The present study describes the development of the Determinants of Implementation Behavior Questionnaire (DIBQ) and investigates the reliability and validity of this Theoretical Domains Framework (TDF)-based questionnaire.
  
  
  METHODS
  The DIBQ was developed to measure the potential behavioral determinants of the 12-domain version of the TDF (Michie et al., 2005). We identified existing questionnaires including items assessing constructs within TDF domains and developed new items where needed. Confirmatory factor analysis was used to examine whether the predefined structure of the TDF-based questionnaire was supported by the data. Cronbach's alpha was calculated to assess internal consistency reliability of the questionnaire, and domains' discriminant validity was investigated.
  
  
  RESULTS
  We developed an initial questionnaire containing 100 items assessing 12 domains. Results obtained from confirmatory factor analysis and Cronbach's alpha resulted in the final questionnaire consisting of 93 items assessing 18 domains, explaining 63.3% of the variance, and internal consistency reliability values ranging from .68 to .93. Domains demonstrated good discriminant validity, although the domains 'Knowledge' and 'Skills' and the domains 'Skills' and 'Social/professional role and identity' were highly correlated.
  
  
  CONCLUSIONS
  We have developed a valid and reliable questionnaire that can be used to assess potential determinants of healthcare professional implementation behavior following the theoretical domains of the TDF. The DIBQ can be used by researchers and practitioners who are interested in identifying determinants of implementation behaviors in order to be able to develop effective strategies to improve healthcare professionals' implementation behaviors. Furthermore, the findings provide a novel validation of the TDF and indicate that the domain 'Environmental context and resources' might be divided into several environment-related domains.
authors.affiliation: Clinical, Health and Neuropsychology, Leiden University, Wassenaarseweg 52, Leiden, The Netherlands. huijgjm@fsw.leidenuniv.nl.
authors.forename: Johanna M
authors.initials: JM
authors.lastname: Huijg
authors.forename: Winifred A
authors.initials: WA
authors.lastname: Gebhardt
authors.forename: Elise
authors.initials: E
authors.lastname: Dusseldorp
authors.forename: Marieke W
authors.initials: MW
authors.lastname: Verheijden
authors.forename: Nicolette
authors.initials: N
authors.lastname: van der Zouwe
authors.forename: Barend J C
authors.initials: BJ
authors.lastname: Middelkoop
authors.forename: Mathilde R
authors.initials: MR
authors.lastname: Crone
mesh_terms: D000328:Adult; D001291:Attitude of Health Personnel; D001519:Behavior; D002983:Clinical Competence; D005163:Factor Analysis, Statistical; D005260:Female; D007722:Health Knowledge, Attitudes, Practice; D006801:Humans; D008297:Male; D008875:Middle Aged; D008962:Models, Theoretical; D059825:Physical Therapists / Q000523:psychology*; D024382:Professional Role; D011594:Psychometrics; D015203:Reproducibility of Results; D012959:Socioeconomic Factors; D011795:Surveys and Questionnaires