Analysis Within the Systems Development Life-Cycle - 1st Edition - ISBN: 9780080341019, 9781483140810

Analysis Within the Systems Development Life-Cycle

1st Edition

Book 2 Data Analysis — The Methods

Authors: Rosemary Rock-Evans
eBook ISBN: 9781483140810
Imprint: Pergamon
Published Date: 1st January 1987
Page Count: 314
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Description

Analysis within the Systems Development Life-Cycle: Book 2, Data Analysis—The Methods describes the methods for carrying out data analysis within the systems development life-cycle and demonstrates how the results of fact gathering can be used to produce and verify the analysis deliverables. A number of alternative methods of analysis other than normalization are suggested. Comprised of seven chapters, this book shows the tasks to be carried out in the logical order of progression—preparation, collection, analysis of the existing system (which comprises the tasks of synthesis, verification, and approval)—and in each case how the input from the previous task is converted to the output for the next task until the final output—the verified approved deliverables—is obtained. The first chapter puts analysis into its place in the Systems Development Cycle (SDC) and explains what analysis really means. The next chapters cover, in logical sequence of dependency, the actual tasks of data analysis. The advantages and disadvantages of each method are described in the context of the life-cycle as a whole and in terms of the reliability of raw input, time problems, and so on. Each of the data models obtained using the different methods can be combined and subsequently refined using a number of step-by-step checks. The final chapter shows how the meta-model can be expanded by considering the intermediate outputs of the tasks of data analysis. This text will be of interest to systems analysts and designers and those who are involved in expert systems.

Table of Contents


Preface

Introduction

Acknowledgments

Chapter 1 Introduction

1 Deliverables

2 The Task of Analysis

The Nature of Systems

Stages of Systems

3 Summary

Chapter 2 Preparation

1 Definition of the Preparation Task

The Inputs to Preparation

The Outputs of the Preparation Task

2 Establish Which Areas Come within the Scope

Identify the Designed System

Identify the Real Worlds Available

3 Identify and Record Sources Available

Users/Jobs/People

Documentation Available

Analysts/Designers

4 Decide on Best Source for Area of Input Required

5 Decide on Method of Collection

Interview

Phone Call

Meeting

Teleconferencing

Questionnaire

Co-option

Observation

Participation

Collection as Appropriate

Collection Systems

Unstructured Data

6 Summary

Chapter 3 Collection

1 Introduction

2 Plan Collection Sessions

Identify the Planned Sessions Required

Decide Sampling to be Used

Identify Actual Sessions Required

Select Sessions Based on Time Constraints

Sequence

3 Arrange Collection Session

Obtain Permission to Hold

Decide on Participants

Decide Location

Decide Times and Dates

Produce List of Topics

Produce Agenda/Questionnaire

Confirm Collection Session

Decide Method of Fact Recording

Other Tasks

4 Hold Collection Session

Collecting questionnaires

Interviewing/Phone Call

Holding a Meeting or Teleconference

The Observation/Experimentation Process

Participation

Collection of Documentation

Co-Option

5 Validate Raw Input

6 Summary

Chapter 4 Synthesis

1 Introduction

2 Convert Data to Deliverable Form

Convert Real World Data

Convert Design Abstraction Deliverables to Analysis Deliverables

Convert Design Occurrences

Summary

3 Match and Compare Models to Produce one Comprehensive Model

4 Refine the Result

Generalize the Entity Types

Search for Synonymous Entity Types

Generalize Model over Time

Remove Redundant Relationship Types

Expand Many-to-Many Relationship Types

Investigate One-to-One Relationship Types

Generalize Attribute Types

Ensure That Every Part of the Attribute Type Name is Essential to Its Definition

Ensure That No Artificial 'Moves' of Attribute Values Occur

Remove Entity Types Which Have No Attribute Types Other than Their Identifier

Remove 'Embedded' Relationship Types

Remove 'Repeating Groups' of Attribute Types

Remove Artificial Dependencies between Attribute Types

Remove Duplicated Attribute Types

Check That the Attribute Types and Entity Types Give a Stable and Historical Representation of the Real World

Check That Every Permitted Value Can Be Described by an Attribute Type

5 Summary

Chapter 5 Verification

1 Introduction

2 Verification That the Model is a True Representation of the Real World

Double Sourcing

Duplicate Sourcing

Different Sample

3 Verification That the Model is Complete, Logically Sound and Consistent

Duplicate Synthesis

Quality Control

Joint Walkthrough

4 Summary

Chapter 6 Approval

1 Introduction

Definition

Objective/Purpose

Who Gives Approval?

2 The Process of Approval

Decide Method of Approval

Produce Report

Conduct User Approval Session

Obtaining Approval/Sign off

3 Summary

Chapter 7 Summary

1 Introduction

2 The Main Activities Covered in this Book

The Effect on the Meta-model and the Deliverables of Data Analysis

3 Your General questions Answered

Documentation—Forms or a Data Dictionary?

What Can Go Wrong/What Must be Prepared for?

How to Get Started?

Glossary and Acronyms

Index

Details

No. of pages:
314
Language:
English
Copyright:
© Pergamon 1987
Published:
Imprint:
Pergamon
eBook ISBN:
9781483140810

About the Author

Rosemary Rock-Evans