Acts is a test generation tool for constructing t-way combinatorial test sets developed using the Java API. Acts has a Java-Swing based User Interface which allows the user to define a System under test, constraints and relations.. Currently, it supports t-way test set generation with t ranging from 2 to 6. Combinatorial testing has been shown very effective in detecting faults that are caused by unexpected interactions between different contributing factors. In this section, we provide an overview of the major features of Acts.