# Is our code Cohesive

LCOM(Lack of cohesion in methods) measures cohesion of a class.
It’s the sum of set of methods not shared via sharing fields and the formula is 
 
                                             
![LCOM_Formula.PNG](https://cdn.hashnode.com/res/hashnode/image/upload/v1653027361580/22ru-mfxu.PNG align="left")

Consider a class with private fields PF1 , PF2 , PF3  and methods M1() , M2 () , M3 () and the dependencies  between private fields and methods illustrated in the below diagram 

![LCOM_ClassStructure.PNG](https://cdn.hashnode.com/res/hashnode/image/upload/v1653027436320/lTFFnZqJe.PNG align="left")


Class A all private variables are shared by all the methods which is a good cohesion.

 Class B each private variables are shared by only one method which is bad cohesion .Each  of  the method and its dependent private field could be moved to its own separate class

Class C is a Okay cohesive class , still m1 method and its private field pf1 could be moved to its own separate  class.

Consider LCOM while you refactor your code next time.

https://www.pitt.edu/~ckemerer/CK%20research%20papers/MetricForOOD_ChidamberKemerer94.pdf