Legal Info and Quality Assurance

Disclaimer

The latest version of algebrahelp.com calculators should still be considered in the testing phase. While we are very concerned with accuracy, we cannot gurantee it. Do not use the calculators in any way which may put people, property, or anything of value at risk.

Algebrahelp.com may log and monitor then input and output of the calculators for quality assurance purposes.

That being said, you may be interested in our Quality Assurance practices.

Quality Assurance

How We Test

During the Winter of 2003-2004, algebrahelp.com implemented a rigorous testing procedure in effort improve the quality of Calculator releases. The procedure described below is use on the following calculators

• Equation (solving, simplifying, and factoring)
• Expression (simplifying, factoring)
• Function Graphing
• Number Factoring
• Fraction Simplifying

Other calculators will be tested in a similar fashion in the near future.

In 2003, the code used by the calculators listed above was rewritten from the ground up to improve the accuracy of the calculator and provide a platform that could be extended with more advanced features. Low-level tests, known as unit tests, were written along with the calculator itself. Each test confirms that a particular function within the code is working as specified. As of June 2004, over 650 tests were implemented, each one passed prior to release.

In addition to the unit tests, problem level tests were implemented for equation solving. As of June 2004, over 300 tests were created from real user input. In each test, an equation is parsed, then displayed and checked against an expected value. Then the equation is simplified and checked again. The equation is then solved for a given variable, if a solution is expected it is verified against a known solution. In addition, 150 tests were implemented to ensure that the calculator reports users' input errors as expected. Each of the problem level tests were passed prior to release. Data entered into the calculators is logged and may be used when the test set is expanded in the future.

Known Issues

More Information

If you have any questions or comments on the calculator or the information provided above, please use the Feedback Form