Systems Development

AIMS 2710AIMS 2710R. NakatsuR. Nakatsu

Overview

Why do IT projects succeed and fail?Two philosophies of systems

development– Systems Development Life Cycle (SDLC)– Prototyping

Alternative Approaches: Outsourcing and Crowdsourcing

Why do IT projects fail?

PricewaterhouseCoopers surveyed 200 companies and found that:Over half of IT projects fail.Only 2.5% of corporations consistently meet their targets of scope, time and cost goals for all types of projects.

Defining Project Success

The project met scope, time and cost goals. The project satisfied the customer and

sponsor. Who is the sponsor? The results of the project met its main

objectives. For example:– Saving the company money– Making the firm more efficient/productive– Providing a good return on investment

What helps projects succeed?Critical Success Factors

1. User Involvement

2. Executive support

3. Clear business objectives

4. Emotional maturity

5. Optimizing scope

6. Agile process

7. Project management expertise

8. Skilled resources

9. Execution

10. Tools and infrastructure

Source: The Standish Group, “Chaos Activity News” (August 2011).

The TraditionalSystems Development Life Cycle

TRADITIONAL SDLC – A traditional method for developing I.S. that partitions the system development process into stages that must be completed sequentially.

A key characteristic of the SDLC approach is extensive formal reviews by project team members and business management at the end of each major step.

1. Systems Analysis

Analyze the problem that the organization is trying to solve with an information system.

Address key business issues during this phase: what is the system supposed to do from a business perspective?Key Tasks During Analysis:

– Define the problem and identify its causes.– Specify the solution– Define new information and processing requirements.

Create a data flow diagram—click here for an example.

2. Systems Design

Build a technical blueprint of how the proposed system will work.

IT specialists complete most of the tasks here.The end user (i.e., the business user) reviews the technical specifications.Issues to consider: programs; user interfaces; database design (e.g., create the ER Diagram); reports; manual procedures; security and controls

3. Implementation

Bring the proposed system to life and place it in the organization.

Monitor the budget and schedule and look for “runaway” projects. Manage scope creep!Key Tasks During Implementation:

– Hardware acquisition and installation– Software development and testing– Training– System documentation

4. ConversionThe process of changing from the old system to the new system.

DIRECT CUTOVER - immediately using the newPARALLEL - using the old and new simultaneouslyPILOT - converting only a group of people firstPIECEMEAL (or phased) – introduce the new system in phases either by functions or by organizational units

5. Production and Maintenance Production is the stage after the new system

is installed and the conversion is complete; during this time the system should be reviewed by user and technical specialists.

Maintenance is necessary for failures and problems that arise during the operation of the system.

You may need to make minor modifications or completely overhaul the system at some point.

Advantages of the SDLC

Uses a structured step-by-step approach. Thorough requirements definition in which

problems are addressed early on in the analysis stage.

Requires key deliverables before proceeding to the next step.

Rigorous methods for analysis, design, and testing of a system.

Disadvantages of the SDLC

A time-consuming and costly process. Some smaller projects suffer from a structured

approach. IT specialists and end users speak different

languages, creating communication gaps. Does not account for evolving requirements

during a project

Alternative to the SDLC: Prototyping

PROTOTYPING involves the building of an experimental system rapidly for end users to evaluate

A PROTOTYPE is a model of a proposed product, service, or system.

It is an interactive, iterative process in which you get plenty of feedback from users of the system.

The Prototyping Process

1.Identify Basic Requirements2.Develop Working Prototype3.Get feedback from End Users4.Revise and Enhance the Prototype

Continue the iterative process between steps 3 and 4 until the end user is satisfied with the prototype.

Prototyping Advantages

Encourages active end-user participation. Can lead to a speedier implementation. Gives end-users a feel for the final system. Helps determine technical feasibility. Helps sell the idea of a proposed system.

Question for discussion: What are the disadvantages of prototyping?