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SDLC - Analysis

SDLC - Analysis. IDEF0 Modelling techniques. Why model processes?. Modelling provides: consensus on the form of existing processes consensus on what is to be changed Modelling costs: lots of time lots of effort. Modelling technique.

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SDLC - Analysis

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  1. SDLC - Analysis IDEF0 Modelling techniques

  2. Why model processes? • Modelling provides: • consensus on the form of existing processes • consensus on what is to be changed • Modelling costs: • lots of time • lots of effort

  3. Modelling technique • Dynamic technique to support the capture of process knowledge • BPWin • computer based tool that encapsulates particular syntax • rules and symbols used to create the model

  4. Architecture of processes Operate Processes Manage Processes Support Processes Set Direction Formulate Strategies Direct Business Get Order Develop Product Fulfil Order Support Product Manage Finance Support Personnel Manage Technology Corporate Learning

  5. Operate processes

  6. IDEF0 introduction • Background • Activities • ICOMs • Decomposition • Consistency • Node index • IDEF0 Rules

  7. IDEF0 background • US military system analysis tool • Developed during the 1970’s • Part of Polaris programme • Used to model missile development activities • Modified for business use • IDEF0, IDEF1.x, IDEF2, IDEF3

  8. Get order Develop product Fulfil order Support product IDEF0 - activities • What is actually done in the system order design product support

  9. IDEF0 - ICOMs • Inputs - physical or informational • Output - physical or informational • Mechanism - enables activity to occur • Control - governs activity / transformation

  10. IDEF - the box Trigger / Control (noun) Activity (verb) Output (noun) Input (noun) A1 Mechanism (noun)

  11. C 1 I O 1 1 M 1 IDEF0 - Context diagram Activity (verb) A1 A-0

  12. C 1 I O 1 1 M 1 IDEF0 - Top Level A1 A2 A3 A4 A0

  13. IDEF0 - Decomposition A1 A2 A3 A4 A41 A42 A43

  14. IDEF0 - Node Tree • A0 System Transformation • A1 High level process 1 • A2 High level process 2 • A21 sub process 1 • A22 sub process 2 • A23 sub process 2 • A3 High level process 3

  15. IDEF0 - Rules • Every box must have a control • One diagram per page, 3-6 boxes • Activities must be described by verbs • All arrows must be labelled, including decomposed arrows • Arrows may join or divide • Arrows may be combined at higher levels and decomposed at lower levels

  16. IDEF0 - the process • What activities are being performed • What inputs are being transformed into what outputs • What influences/controls/triggers/ regulates/constrains these activities • What means are required to perform these activities

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