In recent years, researchers have explored the link between coupling and object-oriented programme quality. Several studies have shown correlations between class-level coupling and fault-proneness. Static code analysis quantifies coupling. Statically analysing code helps monitor security, reliability, performance, and maintainability. Static code analysis exposes structural problems and prevents entire classes of issues when done correctly. Most current work was done on non-object oriented code, and dynamic code analysis is more expensive and difficult. This reliance on static analysis might be troublesome for current software systems, because dynamic binding existed before OO.