  In recent years, the complexity of the software is increasing due to
automation of every segment of application. Software is nowhere remained as
one-time development product since its architectural dimension is increasing
with addition of new requirements over a short duration. Object Oriented
Development (OOD) methodology is a popular development approach for such
systems which perceives and models the requirements as real world entities.
Classes and Objects logically represent the entities in the solution space and
quality of the software is directly depending on the design quality of these
logical entities. Cohesion and Coupling (C&C) are two major design decisive
factors in OOD which impacts the design of a class and dependency between them
in complex software. It is also most significant to measure C&C for software to
control the complexity level as requirements increases. Several metrics are in
practice to quantify C&C which plays a major role in measuring the design
quality. The software industries are focusing on increasing and measuring the
quality of the product through quality design to continue their market image in
the competitive world. As a part of our research, this paper highlights on the
impact of C&C on design quality of a complex system and its measures to
quantify the overall quality of software.
