Don Normans Principles of Design

The design concept of constraining refers to determining ways of restricting the kind of user interaction that can take place at a given moment. There are various ways this can be achieved.

This refers to the relationship between controls and their effects in the world. Nearly all artifacts need some kind of mapping between controls and effects.

This refers to designing interfaces to have similar operations and use similar elements for achieving similar tasks. In particular, a consistent interface is one that follows rules, such as using the same operation to select all objects.

Make sure that users know how to use your platform, affordance is A term used to refer to an attribute of an object that allows people to know how to use it .At a very simple level, to afford means to give a clue