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Test driven development (TDD) has been extensively researched and compared to traditional approaches (test last development, TLD). Existing literature reviews show varying results for TDD.

This study investigates how the conclusions of existing literature reviews change when taking two study quality dimension into account, namely rigor and relevance.

In this study a systematic literature review has been conducted and the results of the identified primary studies have been analyzed with respect to rigor and relevance scores using the assessment rubric proposed by Ivarsson and Gorschek 2011. Rigor and relevance are rated on a scale, which is explained in this paper. Four categories of studies were defined based on high/low rigor and relevance.

We found that studies in the four categories come to different conclusions. In particular, studies with a high rigor and relevance scores …