This systematic review and meta-analysis is part of a larger APA Task Force "Psychotherapy Skills and Methods That Work" innitiated by Hill & Norcross (2022). For each chapter, experts of the field are invited as first authors / principal investigators to contribute a systematic review and meta-analysis. First authors invite experts of the field that represent different psychotherapy traditions. The present systematic review and meta-analysis is focused on "strengths-based and resilience-based strategies", it provides a theoretical and empirical overview of strengths-based strategies in psychotherapy. Contributors are: Christoph Flückiger (University of Zürich), Thomas Munder (University of Zürich), A. C. Del Re (University of Zürich), Nili Solomonov (Weill Cornell Medicine, New York). The chapters follow a required structure: Abstract, Introduction, Definitions, Clinical Description and Indication, Assessment, Clinical Examples, Landmark Studies and Previous Reviews, Research Review, Possible side effects/harm/errors, Diversity considerations, Limitation of the Research, Training implications, Therapeutic Practices