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Context: Continuous experimentation and A/B testing is an establishedindustry practice that has been researched for more than 10 years. Our aim isto synthesize the conducted research.  Objective: We wanted to find the core constituents of a framework forcontinuous experimentation and the solutions that are applied within the field.Finally, we were interested in the challenges and benefits reported ofcontinuous experimentation.  Method: We applied forward snowballing on a known set of papers andidentified a total of 128 relevant papers. Based on this set of papers weperformed two qualitative narrative syntheses and a thematic synthesis toanswer the research questions.  Results: The framework constituents for continuous experimentation includeexperimentation processes as well as supportive technical and organizationalinfrastructure. The solutions found in the literature were synthesized to ninethemes, e.g. experiment design, automated experiments, or metric specification.Concerning the challenges of continuous experimentation, the analysisidentified cultural, organizational, business, technical, statistical, ethical,and domain-specific challenges. Further, the study concludes that the benefitsof experimentation are mostly implicit in the studies.  Conclusions: The research on continuous experimentation has yielded a largebody of knowledge on experimentation. The synthesis of published researchpresented within include recommended infrastructure and experimentation processmodels, guidelines to mitigate the identified challenges, and what problems thevarious published solutions solve.

Controlled Experimentation in Continuous Experimentation: Knowledge and Challenges