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Técnica del Índice de mantenibilidad

Module by: Miguel-Angel Sicilia. E-mail the authorEdited By: Verónica De la Morena

Summary: Concepto de Índice de Mantenibilidad según Welker.

El Índice de Mantenibilidad (IM) mide la facilidad de mantenimiento del producto considerado.

Toda acción de mantenimiento puede dividirse en 3 tareas:

  • comprensión de los cambios que deben hacerse
  • realización de las modificaciones necesarias
  • pruebas de los cambios realizados

Welker1, en 1995, definió el concepto de índice de mantenibilidad IM para intentar cuantificar la mantenibilidad de un sistema. Este concepto ha sido perfeccionado por múltiples autores a lo largo de estos años.

El IM de un conjunto de programas más básico es un polinomio de la siguiente forma:

IM = 171 - 5.2 * ln(aveV) - 0.23 * aveV(g') - 16.2 * ln (aveLOC) + 50 * sin (sqrt(2.4 * perCM)) IM = 171 - 5.2 * ln(aveV) - 0.23 * aveV(g') - 16.2 * ln (aveLOC) + 50 * sin (sqrt(2.4 * perCM))

Donde aveV es la media del volumen V por módulo según Halstead, aveV(g’) es la media de la complejidad cilclomática por módulo, aveLOC es la media del número de líneas de código por módulo y perCM es la media porcentual de líneas de código comentadas.

Cuanto mayor sea el IM, mayor mantenibilidad tendrá el sistema.

Footnotes

  1. Welker, K.D. y Oman, P.W. (1995) Software Maintainability Metrics Models in Practice. Crosstalk, Journal of Defense Software Engineering 8, 11 (November/December 1995), pp. 19-23.

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