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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

SDLC - Analysis

IDEF0 Modelling techniques

why model processes
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
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
architecture of processes
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

idef0 introduction
IDEF0 introduction
  • Background
  • Activities
  • ICOMs
  • Decomposition
  • Consistency
  • Node index
  • IDEF0 Rules
idef0 background
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
idef0 activities

Get order

Develop product

Fulfil order

Support product

IDEF0 - activities
  • What is actually done in the system

order

design

product

support

idef0 icoms
IDEF0 - ICOMs
  • Inputs - physical or informational
  • Output - physical or informational
  • Mechanism - enables activity to occur
  • Control - governs activity / transformation
idef the box
IDEF - the box

Trigger /

Control (noun)

Activity

(verb)

Output (noun)

Input (noun)

A1

Mechanism (noun)

idef0 context diagram

C

1

I

O

1

1

M

1

IDEF0 - Context diagram

Activity

(verb)

A1

A-0

idef0 top level

C

1

I

O

1

1

M

1

IDEF0 - Top Level

A1

A2

A3

A4

A0

idef0 decomposition
IDEF0 - Decomposition

A1

A2

A3

A4

A41

A42

A43

idef0 node tree
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
idef0 rules
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
idef0 the process
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