Software testing is the one of the primary methods used in the validation and verification of output in the software development industry. It is seen as a key method for achieving software quality, reliability, fitness for purpose and customer satisfaction. Software testing is however an expensive process accounting for as much as 50% of the cost of developing software based systems. In recent years, software testing as a discipline has come under pressure due to time, cost and skills constraints. These constraints impact negatively upon software test effectiveness. Therefore it is critical to identify and implement test tools that reduce the negative impact of software test constraints on software test effectiveness. In this paper the researchers examines some of the most popular software testing tools such as test case prioritisation, test suite reduction and test selection criteria, to identify: Which individual test tools are most likely to yield optimal test effectiveness and,...