COSMIC Sizing Forums COSMIC Size measurement Doubt about the contextual diagram

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    • #10256
      Jorge Chavez
      Participant

      A group of newly certified people are discussing about the topic of the context diagram.
      The question is this: Should the box with a thick outline of the context diagram necessarily represent a functional process or can it represent a piece of software that is not necessarily a functional process?

      Un grupo de personas recién certificadas estamos discutiendo acerca del tema del diagrama de contexto.
      La duda es la siguiente: ¿La caja con contorno grueso del diagrama de contexto deberá representar obligatoriamente a un proceso funcional o puede representar a una pieza de software que no necesariamente es un proceso funcional?

    • #10258
      Arlan Lesterhuis
      Participant

      In the Measurement Manual see Figure 2.5 in section 2.3.3, especially the interpretation of the box with the thick outline symbol: it represents a piece of software (of which usually multiple functional processes can be identified in the next measurement phase). The Figures 2.6 and 2.7 show examples of context diagrams.

    • #10260
      Charles Symons
      Participant

      Jorge, on the cosmic-sizing website, there is a ‘Guideline for Measurement Strategy Patterns’ which describes several context diagram patterns that are commonly found for different types of software.
      I do not think that a piece of software can exist that is useful if it does not have complete functional processes, unless it is being developed and is not yet ‘complete’. Almost by definition, if a piece of software has ‘incomplete’ functional processes, it is not yet in a state where it can deliver useful functionality.

    • #10262
      Jorge Chavez
      Participant

      Thanks for you answers, so I can say that is correct to map more than one functional process (a piece of software can be more than one functional process) in one context diagram at the same time?

    • #10264

      Estimado Jorge,

      Se utilizan los Diagramas de Contexto para mostrar el alcance de una pieza de software que se va a medir dentro de su contexto de usuarios funcionales, por lo general también muestran almacenamiento persistente.

      La caja con contorno negro y grueso que comentas representa la pieza de software que se desea medir.

      Si deseas diagramar los procesos funcionales, puedes utilizar los Diagramas de Secuencia de Mensajes, donde los procesos funcionales se representan por medio de una flecha vertical hacia abajo, flechas horizontales representan los movimientos de datos y una línea vertical punteada (discontinua) representa la frontera.

      Saludos

    • #10266
      Charles Symons
      Participant

      Jorge, the short answer is ‘yes’. Context diagrams are useful in the Measurement Strategy phase to help understand the scope and functional users of pieces of software to be measured.

    • #10268
      Jorge Chavez
      Participant

      Thank you very much.

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