week 10 - method of system development
TRANSCRIPT
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McGraw-Hill © 2008 The McGraw-Hill Companies, Inc. All rights reserved.
Chapter 5.1( week 10 )
SYSTEMS DEVELOPMENTPhases, Tools, and Techniques
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STUDENT LEARNING OUTCOMES
1. Define the traditional systems development lifecycle (SDLC) and describe the 7 major phaseswithin it.
2. Compare and contrast the various component-based development methodologies.
3. Describe the selfsourcing process as an
alternative to the traditional SDLC.
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STUDENT LEARNING OUTCOMES
4. Discuss the importance of prototyping andprototyping within any systems developmentmethodology
5. Describe the outsourcing environment and howoutsourcing works.
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SAVING LIVES THROUGH SYSTEMSDEVELOPMENT
Centers for Disease Control (CDC) tracks a wealthof information
Antimicrobial-resistant infections in hospitals Influenza outbreaks
Terrorist biochemical attacks
Bacteria counts in rivers and stagnant ponds, etc
Unfortunately, most of that information is stored inseparate IT systems that do not communicate witheach other
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SAVING LIVES THROUGH SYSTEMSDEVELOPMENT
The CDC is using a service-oriented architecture(SoA) to integrate all those systems and information
An SoA treats every component of an IT system – adatabase file, a server, a CRM software solution, etc – as a building block
Within an SoA, those building blocks can be
“plugged and played” so that everything workstogether in an integrated fashion
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SAVING LIVES THROUGH SYSTEMSDEVELOPMENT
1. All computers use a common binary baselanguage. That being true, why is it so difficult toget computer systems to easily communicate witheach other?
2. In systems development, prototyping is used tobuild a model of a proposed system. How have
you used prototyping in your personal life?3. Outsourcing – going to another company for
systems development – is big business. Whywould the CDC not want to pursue outsourcing?
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INTRODUCTION
Information systems are the support structure formeeting the company’s strategies and goals
New systems are created because employeesrequest them
New systems are created to obtain a competitiveadvantage
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INTRODUCTION
When developing a new system, you have 3 “who”
choices…
1. Insourcing – IT specialists inside your organization
2. Selfsourcing – do-it-yourself approach many endusers take with little or no help from IT specialists
3. Outsourcing – a third-party organization (i.e., let
someone do the work and pay them for it)
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CHAPTER ORGANIZATION
1. Insourcing and the SDLC
Learning outcome #1
2. Component-Based Development
Learning outcome #23. Selfsourcing
Learning outcome #3
4. Prototyping
Learning outcome #4
5. Outsourcing
Learning outcome #5
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INSOURCING AND THE SDLC
Systems development life cycle (SDLC) - astructured step-by-step approach for developinginformation systems
7 distinct phases, each with well-defined activities
Also called a waterfall methodology , an approachin which each phase of the SDLC is followed by
another, from planning through implementation
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SDLC Phases & Major Activities
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SDLC as a Waterfall Methodology
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Phase 1: Planning
Planning phase - create a solid plan fordeveloping your information system
Three primary planning activities:1. Define the system to be developed
You can’t build every system, so you make choices
based on your organization’s priorities, which may be
expressed as critical success factors
Critical success factor (CSF) - a factor simply criticalto your organization’s success
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Phase 1: Planning
2. Set the project scope
Project scope - clearly defines the high-level systemrequirements
Scope creep - occurs when the scope of the projectincreases
Feature creep - occurs when developers add extrafeatures that were not part of the initial requirements
Project scope document - a written definition of theproject scope and is usually no longer than a paragraph
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Phase 1: Planning
3. Develop the project plan including tasks, resources,and timeframes
Project plan - defines the what, when, and who
questions of system development Project manager - an individual who is an expert in
project planning and management, defines anddevelops the project plan and tracks the plan to ensure
all key project milestones are completed on time Project milestones - represent key dates for which
you need a certain group of activities performed
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Phase 1: Planning
Sample Project Plan
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Phase 2: Analysis
Analysis phase - involves end users and ITspecialists working together to gather, understand,and document the business requirements for theproposed system
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Phase 2: Analysis
Two primary analysis activities:
1. Gather the business requirements
Business requirements - the detailed set ofknowledge worker requests that the system must meetin order to be successful
Business requirements address the “why” and “what” of
your development activities
Joint application development (JAD ) - knowledgeworkers and IT specialists meet, sometimes for severaldays, to define or review the business requirements forthe system
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Phase 2: Analysis
2. Prioritize the requirements
Requirements definition document – prioritizes thebusiness requirements and places them in a formal
comprehensive document Again, you probably can’t do everything, so prioritizing
is important
Users sign off on this document which clearly sets the
scope for the project
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Phase 2: Analysis
Take time during analysis to get the business requirements correct. If
you find errors, fix them immediately. The cost to fix an error in the earlystages of the SDLC is relatively small. In later stages, the cost is huge.
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Phase 3: Design
Design phase - build a technical blueprint of howthe proposed system will work
Two primary design activities:
1. Design the technical architecture
Technical architecture - defines the hardware,software, and telecommunications equipment requiredto run the system
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Phase 3: Design
2. Design system models
This includes GUI screens that users will interface with,database designs (see XLM/C), report formats,
software steps, etc
Starting with design, you take on less of an activeparticipation role and act more as a “quality control”
function, ensuring that the IT people are designinga system to meet your needs
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Phase 4: Development
Development phase - take all of your detaileddesign documents from the design phase andtransform them into an actual system
Two primary development activities:
1. Build the technical architecture
2. Build the database and programs
Both of these activities are mostly performed by ITspecialists
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Phase 5: Testing
Testing phase - verifies that the system worksand meets all of the business requirementsdefined in the analysis phase
Two primary testing activities:
1. Write the test conditions
Test conditions - the detailed steps the system mustperform along with the expected results of each step
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Phase 5: Testing
2. Perform the testing of the system
Unit testing – tests individual units of code
System testing – verifies that the units of code
function correctly when integrated Integration testing – verifies that separate systems
work together
User acceptance testing (UAT) – determines if the
system satisfies the business requirements
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Phase 6: Implementation
Implementation phase - distribute the system toall of the knowledge workers and they begin usingthe system to perform their everyday jobs
Two primary implementation activities
1. Write detailed user documentation
User documentation - highlights how to use thesystem
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Phase 6: Implementation
2. Provide training for the system users
Online training - runs over the Internet or off a CD-ROM
Workshop training - is held in a classroomenvironment and lead by an instructor
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Phase 6: Implementation
Choose the right implementation method
Parallel implementation – use both the old and newsystem simultaneously
Plunge implementation – discard the old systemcompletely and use the new
Pilot implementation – start with small groups ofpeople on the new system and gradually add more
users
Phased implementation – implement the newsystem in phases
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Phase 7: Maintenance
Maintenance phase - monitor and support thenew system to ensure it continues to meet thebusiness goals
Two primary maintenance activities:
1. Build a help desk to support the system users
Help desk - a group of people who responds toknowledge workers’ questions
2. Provide an environment to support system changes
COMPONENT-BASED
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COMPONENT BASEDDEVELOPMENT
The SDLC focuses only on the project at hand
Component-based development (CBD) – focuseson building small self-contained blocks of code(components) that can be reused across a variety ofapplications
CBD focuses on
1. Using already-developed components to buildsystems quickly
2. Building new components as needed that can beused in all future systems
Component-Based Development
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Component Based DevelopmentMethodologies
Rapid application development (RAD)
Extreme programming (XP)
Agile methodology
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Rapid Application Development (RAD)
Rapid application development (RAD) (also calledrapid prototyping ) - emphasizes extensive userinvolvement in the rapid and evolutionary
construction of working prototypes of a system toaccelerate the systems development process
Prototypes are models of the software components
The development team continually designs,develops, and tests the component prototypes untilthey are finished
R id A li i D l (RAD)
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Rapid Application Development (RAD)
Build newsoftware
components
Use already-existing software
components
E t P i (XP)
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Extreme Programming (XP)
Extreme programming (XP) - breaks a project intotiny phases and developers cannot continue on to thenext phase until the first phase is complete
A il M th d l
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Agile Methodology
Agile methodology - a form of XP, aims forcustomer satisfaction through early and continuousdelivery of useful software components
S A A A hit t P ti
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SoA – An Architecture Perspective
Service-oriented architecture (SoA) – perspectivethat focuses on the development, use, and reuse ofsmall self-contained blocks of code (called services )
to meet all application software needs
All CBD methodologies adhere to an SoA
Services are the same as components , which are
the same as small self-contained blocks of codeMore in Chapter 7
SELFSOURCING
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SELFSOURCING
Selfsourcing (end-user development) – thedevelopment and support of IT systems by endusers with little or no help from IT specialists
Do-it-yourself systems development approach
Can relieve IT specialists of the burden ofdeveloping many smaller systems
Selfso rcing Approach
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Selfsourcing Approach
Is similar to traditional SDLC
Big exception is that design, development, testing,and implementation are replaced by the process of
prototyping
Prototyping is the process of building models, and – in this case – continually refining those models until
they become the final system
Selfsourcing Approach
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Selfsourcing Approach
Selfsourcing Advantages
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Selfsourcing Advantages
Improves requirements determination
Increases end user participation and sense ofownership
Increases speed of systems development
Reduces invisible backlog
Invisible backlog – list of all systems that an
organization needs to develop but – because of theprioritization of systems development needs – neverget funded because of the lack of organizationalresources
Selfsourcing Disadvantages
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Selfsourcing Disadvantages
Inadequate end user expertise leads to inadequatelydeveloped systems
Lack of organizational focus creates “privatized” IT
systems
Insufficient analysis of design alternatives leads tosubpar IT systems
Lack of documentation and external support leads toshort-lived systems
The Right Tool for the Job
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The Right Tool for the Job
End users must have development tools that:
Are easy to use
Support multiple platforms
Offer low cost of ownership
Support a wide range of data types
PROTOTYPING
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PROTOTYPING
Prototype – a model of a proposed product,service, or system
Prototyping - the process of building a model that
demonstrates the features of a proposed product,service, or system
Proof-of-concept prototype - used to prove thetechnical feasibility of a proposed system
Selling prototype - used to convince people of theworth of a proposed system
The Prototyping Process
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The Prototyping Process
The prototyping process involves four steps:
1. Identify basic requirements
2. Develop initial prototype
3. User review
4. Revise and enhance the prototype
The Prototyping Process
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The Prototyping Process
Advantages of Prototyping
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Advantages of Prototyping
Encourages active user participation
Helps resolve discrepancies among users
Gives users a feel for the final system
Helps determine technical feasibility
Helps sell the idea of a proposed system
Disadvantages of Prototyping
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Disadvantages of Prototyping
Leads people to believe the final system will follow
Gives no indication of performance underoperational conditions
Leads the project team to forgo proper testing anddocumentation
OUTSOURCING
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OUTSOURCING
Outsourcing – the delegation of specified work toa third party for a specified length of time, at aspecified cost, and at a specified level of service
The third “who” option of systems development,after insourcing and selfsourcing
OUTSOURCING
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OUTSOURCING
The main reasons behind the rapid growth of theoutsourcing industry include the following:
Globalization
The Internet
Growing economy and low unemployment rate
Technology
Deregulation
Outsourcing Options
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Outsourcing Options
IT outsourcing for software development can takeone of four forms:
1. Purchase existing software
2. Purchase existing software and pay the publisher tomake certain modifications
3. Purchase existing software and pay the publisher forthe right to make modifications yourself
4. Outsource the development of an entirely new andunique system for which no software exists
Outsourcing Options
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Outsourcing Options
Outsourcing Process
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Outsourcing Process
Like selfsourcing, the selfsourcing process lookssimilar to the traditional SDLC
Big exception here is that you “outsource” most of
the work to another company
Outsourcing Process
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Outsourcing Process
When outsourcing, you’ll develop two vitally important
documents – a request for proposal and a service levelagreement
Outsourcing – RFP
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Outsourcing RFP
Request for proposal (RFP) – formal documentthat describes in excruciating detail your logicalrequirements for a proposed system and invitesoutsourcing organizations (vendors) to submit bids
for its development
In outsourcing, you must tell another organizationwhat you want developed; you do that with an RFP
Therefore, the RFP must be very detailed andcomplete
Some RFPs can take months or even years todevelop
Outsourcing – SLA
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Outsourcing SLA
Service level agreement (SLA) - formalcontractually obligated agreement between twoparties
In outsourcing, it is the legal agreement betweenyou and the vendor and specifically identifies whatthe vendor is going to do (and by when) and howmuch you’re going to pay
Supporting SLA documents – service level specifications and service level objectives – contain very detailed numbers and metrics
Outsourcing Options
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g p
There are three different forms of outsourcing:
1. Onshore outsourcing - the process of engaginganother company within the same country for
services 2. Nearshore outsourcing - contracting an
outsourcing arrangement with a company in anearby country
3. Offshore outsourcing - contracting with a companythat is geographically far away
Offshore Outsourcing
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Primary outsourcing countries are:
India
China
Eastern Europe (including Russia)
Ireland
Israel
Philippines
The Advantages and Disadvantages ofOutsourcing
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Outsourcing
Advantages:
Focus on unique core competencies
Exploit the intellect of another organization
Better predict future costs
Acquire leading-edge technology
Reduce costs
Improve performance accountability
The Advantages and Disadvantages ofOutsourcing
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Outsourcing
Disadvantages:
Reduces technical know-how for future innovation
Reduces degree of control
Increases vulnerability of your strategic information
Increases dependency on other organizations