Code Metrics - Maintainability Index

• This is an index from 0 to 100 indicating the overall maintainability of the member or type or program
• This index is based on the following metrics,
•  Halstead Volume (which factors in the number and use of operands and operators),
• Cyclomatic Complexity
• Lines of Code

Maintainability Index = 171 - 5.2 * log2 (Halstead Volume) - 0.23 * (Cyclomatic Complexity) - 16.2 * log2 (Lines of Code)

• A low number indicates code that is complex and hard to maintain
  

 VSTS2008 has the inbuilt maintainability measuring technique.


Maintainability Definition:

Range	Level
20-100 inclusive	High Maintainability
10-19 inclusive	Moderate Maintainability
0-9 inclusive	Low Maintainability