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Low coupling often correlates with high cohesion, and vice versa. Low coupling is often thought to be a sign of a well-structured computer system and a good design, and when combined with high cohesion, supports the general goals of high readability and maintainability. [citation needed]
Coupling is a measure of how strongly one element is connected to, has knowledge of, or relies on other elements. Low coupling is an evaluative pattern that dictates how to assign responsibilities for the following benefits: lower dependency between the classes, change in one class having a lower impact on other classes, higher reuse potential.
Loose coupling occurs when the dependent class contains a pointer only to an interface, which can then be implemented by one or many concrete classes. This is known as dependency inversion . The dependent class's dependency is to a "contract" specified by the interface; a defined list of methods and/or properties that implementing classes must ...
Cohesion is often contrasted with coupling. High cohesion often correlates with loose coupling, and vice versa. [2] The software metrics of coupling and cohesion were invented by Larry Constantine in the late 1960s as part of Structured Design, based on characteristics of “good” programming practices that reduced maintenance and ...
The law dates back to 1987 when it was first proposed by Ian Holland, who was working on the Demeter Project. This project was the birthplace of a lot of aspect-oriented programming (AOP) principles. A quote in one of the remainders of the project seems to clarify the origins of the name: [4] Demeter. The Greek goddess of Agriculture.
In object-oriented design, the dependency inversion principle is a specific methodology for loosely coupled software modules.When following this principle, the conventional dependency relationships established from high-level, policy-setting modules to low-level, dependency modules are reversed, thus rendering high-level modules independent of the low-level module implementation details.
Software design usually is directed by goals for the resulting system and involves problem-solving and planning – including both high-level software architecture and low-level component and algorithm design. In terms of the waterfall development process, software design is the activity of following requirements specification and before coding ...
In the field of software engineering, the interface segregation principle (ISP) states that no code should be forced to depend on methods it does not use. [1] ISP splits interfaces that are very large into smaller and more specific ones so that clients will only have to know about the methods that are of interest to them.