23 Realist review | 2 Phase 2: The goal was to provide an overview of the current research regarding portfolio use for the support of SRL during clinical WPL. Step 4: In-depth literature search. The in-depth literature search (February 2019) was supported by the librarian who had also assisted during the scoping search. The original search strings were revised to retrieve references regarding the SRL outcomes that are part of the programme theory, e.g. self-assessment and learning cycle (Appendix D). We searched: Pubmed, CINAHL, ERIC, PsycInfo, Embase, and Web of Science. Step 5a: Title and abstract screening. RG and AT screened title and abstract of the references for inclusion, which required that references needed to concern primary research into portfolio use for the support of SRL/SDL (or related outcomes) during clinical WPL. The first three hundred references were assessed and discussed by both reviewers to establish the approach and definitive list of inclusion criteria (Appendix E). The remaining 1744 references were assessed by one reviewer. However, references that raised any doubts were discussed between the two reviewers. Step 5b: Full-text review. The remaining papers were read and assessed by one of the two reviewers, and discussed if there were any doubts regarding inclusion. Step 6: Assessing rigour. We evaluated the rigour of the included papers, as is prescribed by the realist tradition, to provide information on the credibility and trustworthiness of the papers.28 We discussed information on quality assessment criteria and procedures used in other realist reviews,28-30 to compose the following criteria for the rigour evaluation: 1. There is a clear statement of, and rationale for, the research question/aims. 2. Design and study methods are appropriate to answer the research question. 3. Study findings and conclusions are supported by the data. RG paired with the other authors to decide whether the included papers met these criteria. The criteria were evaluated individually first, and later discussed between the pairs to reach consensus.
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