Exploratory testing is the most efficient and effective approach to testing software. It produces useful results from the first hours of testing, and finds the biggest bugs faster than any other approach. Furthermore, it finds bugs that other approaches won’t find at all.
Exploratory testing has no constraints. Its objective is to expose information valuable to stakeholders and assess the software’s quality. Exploratory testers constantly seek “emergent behaviors,” which are behaviors that could not have been predicted before testing began.