Question- What problems arise if two modules have high coupling?

Answer-

Coupling means the interconnection of dissimilar modules with all other or we can say, it tells about the interrelationship of dissimilar modules of a system. A system with high coupling means there are strong interconnections among its modules and if two modules are involved in high coupling it means their interdependence will be very high. Some changes applied to one module will affect the functionality of the any module. Superior the degree of change superior will be its effect on the other. As the dependence is higher such modify will affect modules in a negative manner and in-turn the maintainability of the project is reduced. This will extra decrease the reusability factor of individual modules and hence lead to unsophisticated software. Thus, it is always desirable to have inter-connection and interdependence between modules.