Coupling Categories

Control Coupling

¨      Module m1 & m2 are controlled coupled if:

·        M1 calls m2.

·        An element-of-control is passed between m1 and m2.

¨      Advantages

·        Requires only one entry point to a number of functions.  Justified when the environment only supports a limited number of external symbols.

¨      Consequences

·        Called module is controlled by calling module.  Therefore calling module
changes with the called module

·        Control code provides an additional burden in verification.