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Chapter 10 System Engineering. The Hierarchy. Business Process Engineering. uses an integrated set of procedures, methods, and tools to identify how information systems can best meet the strategic goals of an enterprise focuses first on the enterprise and then on the business area

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Chapter 10 system engineering
Chapter 10System Engineering



Business process engineering
Business Process Engineering

  • uses an integrated set of procedures, methods, and tools to identify how information systems can best meet the strategic goals of an enterprise

  • focuses first on the enterprise and then on the business area

  • creates enterprise models, data models and process models

  • creates a framework for better information management distribution, and control


The bpe hierarchy
The BPE Hierarchy

  • Information strategy planning (ISP)

    • strategic goals defined

    • success factors/business rules identified

    • enterprise model created

  • Business area analysis (BAA)

    • processes/services modeled

    • interrelationships of processes and data

  • Application Engineering

    • a.k.a ... software engineering

    • modeling applications/procedures that address (BAA) and constraints of ISP

  • Construction and delivery

    • using CASE and, testing


Information strategy planning
Information Strategy Planning

  • Management issues

    • define strategic business goals/objectives

    • isolate critical success factors

    • conduct analysis of technology impact

    • perform analysis of strategic systems

  • Technical issues

    • create a top-level data model

    • cluster by business/organizational area

    • refine model and clustering


Defining objectives and goals
Defining Objectives and Goals

  • Objective—general statement of direction

  • Goal—defines measurable objective: “reduce manufactured cost of our product”

    • Subgoals:

      • decrease reject rate by 20% in first 6 months

      • gain 10% price concessions from suppliers

      • re-engineer 30% of components for ease of manufacture during first year

  • objectives tend to be strategic while goals tend to be tactical


Business area analysis
Business Area Analysis

  • define “naturally cohesive groupings of business functions and data”

  • perform many of the same activities as ISP, but narrow scope to individual business area

  • identify existing (old) information systems / determine compatibility with new ISP model

    • define systems that are problematic

    • defining systems that are incompatible with new information model

    • begin to establish re-engineering priorities


The baa process
The BAA Process

admin.

manufacturing

QC

distribution

sales

acct

eng’ring

Process

Decomp.

Diagram

Matrices

e.g.,

entity/process

matrix

Process

Flow

Models

Data

Model



Requirements engineering
Requirements Engineering

  • Elicitation — determining what the customer requires

  • Analysis & negotiation — understanding the relationships among various customer requirements and shaping those relationships to achieve a successful result

  • Requirements specification — building a tangible model of requirements


Requirements engineering1
Requirements Engineering

  • System Modeling — building a representation of requirements that can be assessed for correctness, completeness, and consistency

  • Validation — reviewing the model

  • Management — identify, control and track requirements and the changes that will be made to them




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