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The Patient Preferences for Patient Participation tool (The 4Ps) was developed to aid clinical dialogue and to help patients to 1) depict, 2) prioritise, and 3) evaluate patient participation with 12 pre-set items reiterated in the three sections. An earlier qualitative evaluation of The 4Ps showed promising results. The present study is a psychometric evaluation of The 4Ps in patients with chronic heart or lung disease (n = 108) in primary and outpatient care. Internal scale validity was evaluated using Rasch analysis, and two weeks test-retest reliability of the three sections using kappa/weighted kappa and a prevalence- and bias-adjusted kappa. The 4Ps tool was found to be reasonably valid with a varied reliability. Proposed amendments are rephrasing of two items, and modifications of the rating scale in Section 2. The 4Ps is suggested for use to increase general knowledge of patient participation, but further studies are needed with regards to its implementation. [ABSTRACT FROM AUTHOR]