38 | Chapter 2 Study limitations We conducted a realist review to provide a rich and contextualised overview of portfolio use for the support of SRL. However, to formulate CMOs a reductionist approach was sometimes needed, as we were unable to include all information present in the papers. Consequently, the presence of interactional relationships and/or simultaneously occurring processes was sometimes disregarded, and thus causality within individual CMOs can become overrated. Furthermore, as our literature search was conducted in 2019 it is possible that more recent publications could have provided additional and/or different insights than the ones provided in our model. Lastly, we call attention to the methodological weaknesses of the included papers. This was unsurprising as previous reviews have reported a similar lack of robustness in this domain.2,9 Consequently, we stress the tentative nature of our findings and the developed model.
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