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4.11 Elementary Method "Entity Life History" (ELH)  

  4.11 Elementarmethode "Entity Life History" (ELH)

  • 1 Identification/Definition of the Method
  • 2 Brief Characteristic of the Method
  • 3 Limits of the Methods Application
  • 4 Specification of the Methods Allocation
  • 5 Interfaces
  • 6 Further Literature
  • 7 Functional Tool Requirements
  • 1 Identification/Definition of the Method

    /Hawryszkiewycz, 1988/ chap. 8, pp. 152-158

    2 Brief Characteristic of the Method

    Objective and Purpose

    Method Entity Life History (ELH) analyses the life cycle of the entities in information systems; in this connection it investigates which integrity requirements and successor actions are relevant for each definition of a new entity, the administration of the entity, and the deletion of the entity. ELH is thus used to define the rules and regulations required for the actions with entities (insert, update, delete).

    Means of Representation

    Entity Life Cycle Diagrams that are similarly structured as the state transition diagrams in STM are means of representation. An Entity Life Cycle Diagram is generated for each entity. This diagram illustrates all possible entity states and the (elementary) functions changing the states of the entity.

    3 Limits of the Methods Application

    - not applicable -

    4 Specification of the Methods Allocation

    No. Activity Description
    4.1 SD3.3 - Definition of Requirements for the Functionality In information systems, Entity Life History defines the requirements on functions and data resulting from integrity conditions. In subproduct Technical Requirements.Overall Function of Element, ELH covers the data-oriented qualitative requirements with regard to the data integrity of the information objects.

    5 Interfaces

    No. Interface Observation Information in Annex 1
    5.1 ELH-ER ELH requires E/R models and analyzes the life cycle of the included entities. 4.9 Interface ELH-ER
    5.2 ELH-FNET The function nets describing the possible sequences of functions in an application are balanced with the results of the basic method ELH which document the permitted entity states, the permitted state transitions, and the corresponding functions responsible for this process. 4.10 Interface ELH-FNET

    6 Literature

    /Achatzi, 1991/ Praxis der strukturierten Analyse
    /Hawryszkiewycz, 1988/ Introduction to Systems Analysis and Design

    7 Functional Tool Requirements

    SSD09 - Supporting Information Structuring

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