CHAPTER 13 Acquiring Information Systems and Applications CHAPTER

CHAPTER 13 Acquiring Information Systems and Applications

CHAPTER OUTLINE 13. 1 Planning for and Justifying IT Applications 13. 2 Strategies for Acquiring IT Applications 13. 3 The Traditional Systems Development Life Cycle 13. 4 Alternative Methods and Tools for Systems Development 13. 5 Vendor and Software Selection

LEARNING OBJECTIVES 1. Define an IT strategic plan, identify three objectives it must meet, and describe the four common approaches to cost-benefit analysis. 2. Discuss the four business decisions that companies must make when they acquire new applications. 3. Identify the six processes involved in the systems development life cycle, and explain the primary tasks and importance of each process.

LEARNING OBJECTIVES (continued) 4. Describe four alternative development methods and four tools that augment development methods, and identify at least one advantage and one disadvantage of each method and tool. 5. Analyze the process of vendor and software selection.

13. 1 Planning for and Justifying IT Applications Organizations must analyze the need for the IT application. Each IT application must be justified in terms of costs and benefits. The application portfolio

Information Systems Planning

Information Systems Planning (continued) Organizational Strategic Plan IT Architecture IT Strategic Plan

IT Steering Committee © Image Source/Age Fotostock America, Inc.

IS Operational Plan Contains the following elements: Mission IT environment Objectives of the IT function Constraints of the IT function Application portfolio Resource allocation and project management

Evaluating & Justifying IT Investment: Benefits, Costs & Issues Assessing the costs Fixed costs Total cost of ownership (TCO) Assessing the benefits (Values) Intangible benefits: Benefits from IT that may be very desirable but difficult to place an accurate monetary value on. Comparing the two

Conducting the Cost-Benefit Analysis Using Net Present Value (NPV) Return on investment Breakeven analysis The business case approach

13. 2 Strategies for Acquiring IT Applications Four fundamental business decisions to make before choosing a strategy: (1) How much computer code does the company want to write? (2) How will the company pay for the application? (3) Where will the application run? (4) Where will the application originate?

Strategies for Acquiring IT Applications Purchase a Prewritten Application Customize a Prewritten Application Lease the applications Application Service Providers and Softwareas-a-Service Vendors Use Open-Source Software Outsourcing Custom Development

Operation of an Application Service Provider (ASP) Customer A Customer B Customer C Application Database ASP Data Center

Operation of a Software-as-a-Service (Saa. S) Vendor Customer A Customer B Customer C Application Customer A Customer B Customer C Saa. S Vendor Data Center

13. 3 Traditional Systems Development Life Cycle Software Development Life Cycle (SDLC) Systems Investigation Systems Analysis Systems Design Programming and Testing Implementation Operation and Maintenance

Six-Stage Systems Development Life Cycle (SDLC) with Supporting Tools Busine ss Need Systems Investigati on Deliverabl e: Go/No Go Decision Prototyping Systems Analysis Deliverabl e: User Requirem ent Upper CASE Tools Systems Design Deliverabl e: Technical Specificati on Programmi ng and Testing Joint Application Design (JAD) Implement The System Lower CASE Tools Operation and Maintenanc e

The SDLC Major advantages Control Accountability Error detection Major drawbacks Relatively inflexible Time-consuming and expensive Discourages changes once user requirements are gathered

SDLC – Systems Investigation Begins with the business problem (or opportunity) followed by the feasibility analysis. Feasibility study Deliverable: Go/No-Go Decision

Feasibility Study Technical feasibility Economic feasibility Organizational feasibility Behavioral feasibility

SDLC – System Analysis The examination of the business problem that the organization plans to solve with an information system. Main purpose is to gather information about existing system to determine requirements for the new or improved system. Deliverable is a set of system requirements, also called user requirements.

SDLC – Systems Design Describes how the system will accomplish this task. Deliverable is the technical design that specifies: System outputs, inputs, user interfaces. Hardware, software, databases, telecommunications, personnel & procedures. Blueprint of how these components are integrated.

SDLC – System Design (continued) Scope creep is caused by adding functions after the project has been initiated. Kajano/Shutterstock

SDLC – Programming & Testing Programming involves the translation of a system’s design specification into computer code. Testing checks to see if the computer code will produce the expected and desired results under certain conditions. Testing is designed to delete errors (bugs) in the computer code.

SDLC – Systems Implementation involves three major conversion strategies: Direct Conversion Pilot Conversion Phased Conversion Parallel Conversion (not used much today)

SLDC – Operation & Maintenance Audits are performed to assess the system’s capabilities and to determine if it is being used correctly. Systems need several types of maintenance. Debugging Updating Maintenance

13. 4 Alternative Methods and Tools for Systems Development Joint application design (JAD) Rapid application development (RAD) Agile development End-user development

RAD versus SDLC

Tools for Systems Development Prototyping Integrated computer-assisted software engineering (ICASE) Component-based development Object-oriented development

13. 5 Vendor & Software Selection Step 1: Identify potential vendors. Step 2: Determine the evaluation criteria. Request for proposal (RFP) Step 3: Evaluate vendors and packages. Step 4: Choose the vendor and package Step 5: Negotiate a contract. Step 6: Establish a service level agreement.

Chapter Closing Case • The Problem • The Solution • The Results