Transcript Accounting Information Systems 9th Edition

AIS Development
Strategies
©2003 Prentice Hall Business Publishing,
Accounting Information Systems, 9/e, Romney/Steinbart
1
Learning Objectives
1.
2.
3.
Describe how organizations
purchase application software,
vendor services, and hardware.
Explain how information system
departments develop custom
software.
Explain how end-users develop,
use, and control computerbased information systems.
©2003 Prentice Hall Business Publishing,
Accounting Information Systems, 9/e, Romney/Steinbart
2
Learning Objectives
4.
5.
Explain why organizations
outsource their information
systems, and evaluate the
benefits and risks of this
strategy.
Explain the principles and
challenges of business process
reengineering.
©2003 Prentice Hall Business Publishing,
Accounting Information Systems, 9/e, Romney/Steinbart
3
Learning Objectives
6.
7.
Describe how prototypes are used
to develop an AIS, and discuss the
advantages and disadvantages of
doing so.
Explain what computer-aided
software engineering is and how it
is used in systems development.
©2003 Prentice Hall Business Publishing,
Accounting Information Systems, 9/e, Romney/Steinbart
4
Introduction


This chapter discusses three ways to
obtain a new information system:
purchasing prewritten software,
developing software in-house, and hiring
an outside company (outsourcing).
It also presents ways of speeding up or
improving the development process –
business process reengineering,
prototyping and computer-aided software
engineering (CASE) tools.
©2003 Prentice Hall Business Publishing,
Accounting Information Systems, 9/e, Romney/Steinbart
5
Purchase Software
Canned software is written by software
development companies and is sold on
the open market to a broad range of
users with similar requirements.
 Turnkey systems are a combination of
software and hardware sold as a
package. The vendor installs the entire
system and user needs only to “turn the
key”.

©2003 Prentice Hall Business Publishing,
Accounting Information Systems, 9/e, Romney/Steinbart
6
Purchase Software, continued
The Internet has given companies a
new way to acquire software:
Application service providers (ASPs)
host Web-based software on their
computers and deliver the software to
their clients over the Internet.
©2003 Prentice Hall Business Publishing,
Accounting Information Systems, 9/e, Romney/Steinbart
7
Purchasing Software
and The SDLC

Companies that buy rather than
develop AIS software still go through
the systems development life cycle
(SDLC).
1.
2.
3.
4.
5.
Systems analysis
Conceptual design
Physical design
Implementation and conversion
Operation and maintenance
©2003 Prentice Hall Business Publishing,
Accounting Information Systems, 9/e, Romney/Steinbart
8
The Systems Acquisition Process
Investigate
software
packages
Will package
meet needs?
Yes
Send RFP for
Yes
software
and
hardware
Evaluate
proposal
No
Develop
software
internally
No
Can package
be modified?
Yes
Send RFP for
hardware,
if necessary
Select best
combination
©2003 Prentice Hall Business Publishing,
Accounting Information Systems, 9/e, Romney/Steinbart
9
Development by In-House
IS Department
Most often, organizations develop
their own custom software, because
canned software that fit their specific
needs is not available.
 Developing custom software is difficult
and error-prone.
 It also consumes a great deal of time
and resources.

©2003 Prentice Hall Business Publishing,
Accounting Information Systems, 9/e, Romney/Steinbart
10
Custom Software Development
by an Outside Company
When contracting with an outside
organization, a company should
maintain control over the development
process. Some guidelines:
• Carefully select a developer
• Sign a contract
• Plan and monitor each step
• Maintain effective communication
• Control all costs
©2003 Prentice Hall Business Publishing,
Accounting Information Systems, 9/e, Romney/Steinbart
11
End-User-Developed
Software


End-user computing (EUC) is the hands-on
development, use, and control of computerbased information systems by users.
With the advent of inexpensive PCs and
powerful, inexpensive software, users
began developing their own systems to
create and store data, access and
download company data, and share data
and computer resources in networks.
©2003 Prentice Hall Business Publishing,
Accounting Information Systems, 9/e, Romney/Steinbart
12
End-User-Developed
Software

Examples of end user development uses:
• Retrieving information from company
databases to produce simple reports or to
answer one-time queries
• Performing “what if” sensitivity or statistical
analyses
• Developing applications using prewritten
software (spreadsheet or database system)
• Preparing schedules and lists, such as
depreciation schedules, accounts receivable
aging, and loan amortizations
©2003 Prentice Hall Business Publishing,
Accounting Information Systems, 9/e, Romney/Steinbart
13
Benefits of End-UserDeveloped Software
Benefits of End-User Computing
User creation, control, and implementation
Systems that meet user needs
Timeliness
Freeing up IS resources
Versatility and ease of use
©2003 Prentice Hall Business Publishing,
Accounting Information Systems, 9/e, Romney/Steinbart
14
Risks of End-UserDeveloped Software
Risks of End-User Computing
Logic and development errors
Inadequately tested applications
Inefficient systems
Poorly controlled and documented systems
Systems incompatibility
Duplication of systems
Increased costs
©2003 Prentice Hall Business Publishing,
Accounting Information Systems, 9/e, Romney/Steinbart
15
Managing and Controlling
End-User Computing

Organizations use several different
approaches to mange and control
end-user computing. For example, a
help desk can encourage, support,
coordinate and control end-user
activities.
©2003 Prentice Hall Business Publishing,
Accounting Information Systems, 9/e, Romney/Steinbart
16
Functions of a Help Desk
What are some duties of the help desk?
–
–
–
–
–
–
Providing hot-line assistance to help resolve
problems
Serving as a clearinghouse for information,
coordination, and assistance training end
users, and providing corresponding technical
maintenance and support
Evaluating new end-user hardware and
software products
Assisting with application development
Developing and implementing standards
Controlling corporate data
©2003 Prentice Hall Business Publishing,
Accounting Information Systems, 9/e, Romney/Steinbart
17
Outsource the System

What is outsourcing?


It is hiring an outside company to
handle all or part of an organization’s
data processing activities.
In a mainframe outsourcing
agreement, the outsourcers buy their
client’s computers and hire all or most
of the client’s employees.
©2003 Prentice Hall Business Publishing,
Accounting Information Systems, 9/e, Romney/Steinbart
18
Outsource the System

In a client/server or PC outsourcing
agreement, an organization
outsources a particular service, a
segment of its business, a particular
function, or PC support.
©2003 Prentice Hall Business Publishing,
Accounting Information Systems, 9/e, Romney/Steinbart
19
Outsource the System
Benefits of Outsourcing
A business and information solution
Asset utilization
Access to greater expertise and
more advanced technology
Lower costs
Improved development time
Elimination of peaks and valleys usage
Facilitation of downsizing
©2003 Prentice Hall Business Publishing,
Accounting Information Systems, 9/e, Romney/Steinbart
20
Outsource the System
Risks of Outsourcing
Inflexibility
Loss of control of system and/or data
Reduced competitive advantage
Locked-in system
Unfulfilled goals
Possibility of poor service
©2003 Prentice Hall Business Publishing,
Accounting Information Systems, 9/e, Romney/Steinbart
21
Business Processes
Reengineering



What is business process reengineering
(BPR)?
It is the thorough analysis and complete
redesign of business process and
information systems to achieve
performance improvements.
It is a process that challenges traditional
organizational values and cultures
associated with underperformance.
©2003 Prentice Hall Business Publishing,
Accounting Information Systems, 9/e, Romney/Steinbart
22
Business Processes
Reengineering
BPR reduces a company to its
essential business processes and
focuses on why they are done rather
than on the details of how they are
done.
 It completely reshapes organizational
work practices and information flows
to take advantage of technological
advancements.

©2003 Prentice Hall Business Publishing,
Accounting Information Systems, 9/e, Romney/Steinbart
23
Principles of Reengineering

What are the seven principles
of business processing
reengineering?
1.
2.
3.
Organize around outcomes,
not tasks.
Require those who use the
output to perform the process.
Require those who produce
information to process it.
©2003 Prentice Hall Business Publishing,
Accounting Information Systems, 9/e, Romney/Steinbart
24
Principles of Reengineering
4.
5.
6.
7.
Centralize and disperse data.
Integrate parallel activities
Empower workers, use built-in
controls, and flatten the organization
chart.
Capture data once, at its source.
©2003 Prentice Hall Business Publishing,
Accounting Information Systems, 9/e, Romney/Steinbart
25
Challenges Faced by
Reengineering Efforts
What are some of the obstacles to
reengineering efforts?
Tradition
Resistance
Time requirements
Risk
Lack of management support Skepticism
Retraining
Controls
©2003 Prentice Hall Business Publishing,
Accounting Information Systems, 9/e, Romney/Steinbart
26
Prototyping

What is prototyping?
–

an approach to systems design in
which a simplified working model of a
system is developed.
A prototype, or “first draft,” is quickly
and inexpensively built and provided
to users for testing.
©2003 Prentice Hall Business Publishing,
Accounting Information Systems, 9/e, Romney/Steinbart
27
Prototyping

What four steps are involved in developing
a prototype?
1.
2.
3.
4.
Identify basic systems requirements.
Develop an initial prototype that meets the
agreed-on requirements.
Users identify changes, developers make
changes, and the system is turned over to
the user.
Use the system approved by the users.
©2003 Prentice Hall Business Publishing,
Accounting Information Systems, 9/e, Romney/Steinbart
28
Benefits of Prototyping
Advantages of Prototyping
Better definition of user needs
Higher user involvement and satisfaction
Faster development time
Fewer errors
More opportunity for changes
Less costly
©2003 Prentice Hall Business Publishing,
Accounting Information Systems, 9/e, Romney/Steinbart
29
Disadvantages of
Prototyping
Disadvantages of Prototyping
Significant user time
Less efficient use of system resources
Incomplete systems development
Inadequately tested and
documented systems
Negative behavioral reactions
Unending development
©2003 Prentice Hall Business Publishing,
Accounting Information Systems, 9/e, Romney/Steinbart
30
Computer-Aided Software
Engineering (CASE)



CASE is an integrated package of
computer-based tools that automate
important aspects of the software
development process.
CASE tools are used to plan, analyze,
design, program, and maintain an
information system.
They are also used to enhance the efforts
of managers, users, and programmers in
understanding information needs.
©2003 Prentice Hall Business Publishing,
Accounting Information Systems, 9/e, Romney/Steinbart
31
Computer-Aided Software
Engineering (CASE)


CASE tools do not replace skilled
designers; instead they provide a host of
self-integrated tools that give developers
effective support for all SDLC phases.
CASE software typically has tools for
strategic planning, project and system
management, database design, screen and
report layout, and automatic code
generation.
©2003 Prentice Hall Business Publishing,
Accounting Information Systems, 9/e, Romney/Steinbart
32
Computer-Aided Software
Engineering (CASE)
Advantages of CASE Technology
Improved productivity
Improved program quality
Cost savings
Improved control procedures
Simplified documentation
©2003 Prentice Hall Business Publishing,
Accounting Information Systems, 9/e, Romney/Steinbart
33
Computer-Aided Software
Engineering (CASE)
Disadvantages of CASE Technology
Incompatibility
Cost
Unmet expectations
©2003 Prentice Hall Business Publishing,
Accounting Information Systems, 9/e, Romney/Steinbart
34