Fill in the blank. With equivalence classes you test a range of values both valid and _________ range. Type the correct answer into the text box.

With equivalence classes you test a range of values both valid and invalid range.

Equivalence class testing is a software testing technique where you partition input data into classes of equivalent data, so that you can test one representative from each class. This method helps in reducing the total number of test cases to a manageable level while still effectively covering a range of input scenarios. In this context, valid values represent inputs that the system should accept and process correctly, while invalid values represent inputs that are not acceptable and should be rejected by the system. Thus, by testing both valid and invalid classes, you ensure thorough coverage of different input scenarios leading to more robust software.