This is an early-stage adaptation and usability study of a newly modified intervention with a single small uncontrolled group, generating preliminary evidence of acceptability but not efficacy.
Qualitative descriptive study with small sample (n=16) exploring experiences and needs; generates contextual understanding but lacks quantitative measurement, control group, or hypothesis testing.
A Delphi consensus study developing and validating a therapy protocol through expert panels, lacking empirical clinical outcomes and requiring future RCT testing to establish efficacy.
This is a theoretical review article proposing that universal psychological mechanisms are calibrated by environmental variation; it raises conceptual questions rather than reporting empirical results with effect sizes or comparators.