Maintainability

Maintainability Index

maintainability.index — Composite maintainability estimate (original, unbounded formula).

Item	Value
Definition	MI = 171 - 5.2 * ln(V) - 0.23 * CC - 16.2 * ln(SLOC).
Scope	function, file
Input	halstead.volume (V), complexity.cyclomatic (CC), size.sloc (SLOC)
Calculation	not_applicable unless V > 0 and SLOC > 0. Not rescaled to 0-100.
Unit	index
Language Applicability	partially_language_dependent
Limitations	Inherits the limitations of its inputs; the coefficients were fitted on 1990s code.
Reference	Oman, P. & Hagemeister, J. (1992). Metrics for assessing a software system's maintainability. ICSM.