Below are some important aspects to consider regarding interfaces

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High cohesion and low coupling . This is the fundamental principle of interface design. High cohesion means that each component does one thing, while low coupling means that when an element is modified, the change does not propagate to other elements. Low coupling is achieved by encapsulating implementation details. This means that the interface of an element should not expose internal details of the element, such as the data structures in which the state is stored, since these details must be able to be changed without affecting the interface's clients. Therefore, the interface of an element must be carefully designed so as not to expose implementation details, since having interfaces does not guarantee low coupling.

Defensive programming . When an interface is exposed for use by an external system or for a program to be built using it, additional precautions must be taken regarding the input values ​​of the interface methods. This is part of what is known tunisia phone number data as “defensive programming” and involves, among other things, validating all inputs and considering possible unexpected situations. For internal interfaces, it is possible to relax this aspect a little if it is certain that no values ​​will be received that could cause problems.