# Class Coupling

##### Tags:

- C/AL

##### Categories:

- Best Practice

Do not write functions that have high class coupling. This makes the code hard to maintain.

Bad code

    Any procedure / trigger that has class coupling of > 30

Good code

    Any procedure / trigger that has class coupling of <= 30\.
    Class coupling is computed by summing the unique instances of the following in a code block:
    - every unique usage of a complex C/AL data type (table, codeunit, etc) as 1\.
    - every unique usage of a DotNet type as 1\.

Last modified February 24, 2022: Added tags & categories + cleanup (5ee04366) by waldo1001