Communicational cohesion: Communicational cohesion is when parts of a module are grouped because they operate on the similar data (e.g. a module which operates on the similar record of information). In this all of the elements of a component operate on the similar input data or produce the similar output data. So we can say if a module performs a series of actions related be a sequence of steps to be followed by the product and all actions to be performed on the similar data.