Estudiante ingeniería mecánica

APORTADO POR: Willman Acosta [email protected]
Universidad Nacional Abierta
Caracas – Venezuela

REDES y PERT / CPM

Método del camino crítico

RESUMEN

El PERT/CPM fue diseñado para proporcionar diversos elementos útiles de información para los administradores del proyecto. Primero, el PERT/CPM expone la «ruta crítica» de un proyecto. Estas son las actividades que limitan la duracióndel proyecto. En otras palabras, para lograr que el proyecto se realice pronto, las actividades de la ruta crítica deben realizarse pronto. Por otra parte, si una actividad de la ruta crítica se retarda, el proyecto como un todo se retarda en la misma cantidad. Las actividades que no están en la ruta crítica tienen una cierta cantidad de holgura; esto es, pueden empezarse más tarde, y permitir queel proyecto como un todo se mantenga en programa. El PERT/CPM identifica estas actividades y la cantidad de tiempo disponible para retardos.

INDICE

INTRODUCCION 5

Antecedentes. 6

Definición. 6

Usos. 7

DIFERENCIAS ENTRE PERT Y CPM 7

Metodología. 9

Definición del Proyecto 10

Lista de Actividades 10

Matriz de Secuencias 11

Matriz de Tiempos 13

Red de Actividades15

Procedimiento Para Trazar la Red Medida 18

Costos y Pendientes 23

Compresión de la Red 24

Limitaciones de Tiempo 24

Limitaciones de Recursos 24

Limitaciones Económicas 26

Matriz de Elasticidad 29

Probabilidades de Retraso 34

Graficas PERT 34

EJECUCIÓN Y CONTROL DEL PROYECTO 36

Aprobación del proyecto 36

Órdenes de trabajo 36

Gráficas de control 38EJECUCIÓN Y CONTROL DE LOS PROCESOS 48

PROCEDIMIENTO DE EVALUACIÓN 51

ABSORCIÓN POR HOLGURA 51

ABSORCIÓN POR COMPRESIÓN 51

CUADRO DE EVALUACIÓN 52

Conclusiones 54

Bibliografía 55

INTRODUCCION

Los proyectos en gran escala por una sola vez han existido desde tiempos antiguos; este hecho lo atestigua la construcción de las pirámides de Egipto y los acueductos de Roma. Pero sólodesde hace poco se han analizado por parte de los investigadores operacionales los problemas gerenciales asociados con dichos proyectos.

El problema de la administración de proyectos surgió con el proyecto de armamentos del Polaris, empezando 1958. Con tantas componentes y subcomponentes juntos producidos por diversos fabricantes, se necesitaba una nueva herramienta para programar y controlar elproyecto. El PERT (evaluación de programa y técnica de revisión) fue desarrollado por científicos de la oficina Naval de Proyectos Especiales. Booz, Allen y Hamilton y la División de Sistemas de Armamentos de la Corporación Lockheed Aircraft. La técnica demostró tanta utilidad que ha ganado amplia aceptación tanto en el gobierno como en el sector privado.

Casi al mismo tiempo, la Compañía DuPont,junto con la División UNIVAC de la Remington Rand, desarrolló el método de la ruta crítica (CPM) para controlar el mantenimiento de proyectos de plantas químicas de DuPont. El CPM es idéntico al PERT en concepto y metodología. La diferencia principal entre ellos es simplemente el método por medio del cual se realizan estimados de tiempo para las actividades del proyecto. Con CPM, los tiempos delas actividades son determinísticos. Con PERT, los tiempos de las actividades son probabilísticos o estocásticos.

El PERT/CPM fue diseñado para proporcionar diversos elementos útiles de información para los administradores del proyecto. Primero, el PERT/CPM expone la «ruta crítica» de un proyecto. Estas son las actividades que limitan la duración del proyecto. En otras palabras, para lograr queel proyecto se realice pronto, las actividades de la ruta crítica deben realizarse pronto. Por otra parte, si una actividad de la ruta crítica se retarda, el proyecto como un todo se retarda en la misma cantidad. Las actividades que no están en la ruta crítica tienen una cierta cantidad de holgura; esto es, pueden empezarse más tarde, y permitir que el proyecto como un todo se mantenga en…

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