If you missed Software Testing Controversies, Part 1, you might enjoy reading it over before continuing below.
With most of the major software testing controversies currently happening, there are a variety of software testing methods and levels that can help testers to make the right decisions on a case-by-case basis. A brief overview of these methods and levels is provided here.
The Box Approach – Traditionally, software testing methods are divided into "white box" and "black box" testing.
In white box testing, internal data structures and algorithms are made available. Types of white box testing include:
White box testing methods can be valuable to determine the completeness of a test suite conducted with black box testing methods.
Black box testing means the tester has no access to internal implementation. Types of black box testing include:
A variant on white box and black box testing is gray box testing, which refers to a process where access to data structure is available for planning and designing test cases, but not during the testing process itself. It may also include reserve engineering for testing.
Regression Testing – When code changes cause old defects or bugs to reappear, regression testing comes into use. Reappearing bugs typically occur when newly developed software causes existing code to cease functioning properly. Repeating old tests and checking previously fixed faults are common methods of regression testing.
Hypothesis Testing – This method of testing involves using experimental data to determine whether the results contain enough information to force questioning of existing conclusions.
Paired Comparison Tests – In this type of software testing, two teams - such as quality assurance and development - work together to test and learn more about the software application. Bugs and fixes may be discovered more quickly with the paired comparison test method.
Software testing gives companies an edge when implementing or releasing software. By providing an objective view of whether the software meets business requirements, works as expected and can be implemented repeatedly with the same results, businesses know up front the risks and rewards for executing new software applications.
Software testing professionals have the capacity to save companies billions of dollars each year. In fact, the National Institute of Standards and Technology (NIST) reported that software bugs cost the U.S. economy $59 billion annually. Further, the report states that more than one-third of this total cost, or $22.2 billion, could be eliminated with earlier and more effective identification and removal of software defects. Software testing training provides the essential skills required to take advantage of this burgeoning need in today's technology-dependent business environment.
Adding software testing and security training to the knowledge base held by computer software analysts, programmers or developers has the potential to make companies in every corner of the globe more productive and more profitable. The evidence is clear: thorough, early and consistent software testing strengthens quality and prevents costly defects.
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