Below are some basic Software Testing Principles:

- A necessary part of a test case is a definition of the expected output or result.

- A programmer should avoid attempting to test his or her own program.

- A programming organization should not test its own programs.

- Thoroughly inspect the results of each test.

- Test cases must be written for input conditions that are invalid and unexpected, as well as for those that are valid and expected.

- Examining a program to see if it does not do what it is supposed to do is only half the battle; the other half is seeing whether the program does what it is not supposed to do.

- Avoid throwaway test cases unless the program is truly a throwaway program.

- Do not plan a testing effort under the tacit assumption that no errors will be found.

- The probability of the existence of more errors in a section of a program is proportional to the number of errors already found in that section.

- Software Testing is an extremely creative and intellectually challenging task.