Equivalence Class Partitioning (ECP) is another name for the Equivalence Partitioning Method. It is a software testing technique, OFTEN known as black-box testing, that splits the input DOMAIN into data classes from which test cases can be constructed. An ideal test case identifies a type of error that may necessitate the EXECUTION of a large number of arbitrary test cases before a general error is detected. Equivalence classes are evaluated for given input conditions in equivalence partitioning. When any input is given, the type of input condition is examined, and the Equivalence class defines or explains a COLLECTION of valid or invalid states for this input condition.

• Example 1 - Let's TAKE a look at a typical college admissions procedure. There is a college that admits students depending on their grade point average. Consider a percentage field that will only accept percentages between 50 and 90%; anything higher or lower will result in the program redirecting the visitor to an error page. If the user enters a percentage that is less than 50% or greater than 90%, the equivalence partitioning technique will display an invalid percentage. The equivalence partitioning method will show a valid percentage if the percentage entered is between 50 and 90%.

• Example 2 - Consider the following software application as an example. A software application has a function that accepts only a certain number of numbers, not even larger or fewer than that number. Consider an OTP number with only six digits; anything more or less than six numbers will be rejected, and the application will route the customer or user to an error page. If the user's password is fewer than or equal to six characters, the equivalence partitioning method will display an invalid OTP. The equivalence partitioning technique will display a valid OTP if the password given is precisely six characters.