Aspect-oriented system is a new emerging technique of software development that provides mechanism for implementing cross-cutting concerns. Quality assessment of important characteristics like cohesion, coupling, complexity, reusability, maintaibility, etc. is fairly unexplored for Aspect oriented systems. Through this paper, the authors have tried to find out the correlation between some of the quality characteristic of aspect-oriented system. They have established correlation between cohesion and complexity, Cohesion and Changeability. Then they have find out that whether cohesion metric can be used as indicator for assessing complexity and changeability of aspect oriented system.