The Effect of Team Exploratory Testing -- Experience Report from F-Secure

Practitioners have found exploratory testing (ET) to be cost effective in detecting defects. The team exploratory testing (TET) approach scales exploratory testing to team level. This paper reports the effectiveness of (TET), and the experiences of the participants of TET sessions. The research was carried at F-Secure Corporation, where two projects were investigated. The results show that the TET sessions have good effectiveness and higher efficiency than other testing methods in the company measured in number of defects detected. Furthermore, the TET sessions found more usability defects that other methods. The session participants saw benefits in especially in the joint discussion and learning of the target application. However, with respect to test effectiveness and efficiency we should be cautions as further studies are needed to compensate the limitations of this work.