A precondition is a statement of what must be true for a method to perform its actions correctly.

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A precondition is a statement that specifies the required state of the system (inputs or environment) at the start of a method's execution. It defines what must be true for the method to work correctly. If the precondition is not met, the method might not produce the expected results or it might fail altogether.

A Precondition Is a Statement of What Must Be True