The operation of a system or application under controlled conditions refers to 'software testing'. Software testing is carried out, in order to evaluate the results of the operation. In the process of software testing, the controlled conditions would include both normal and abnormal conditions.
While testing applications, testers would intentionally try to make things go wrong in order to determine if application works well and is error-free. Software testing teams usually consist of testers, developers and project managers. At times software testing would also include a part of QA testing.