ISYS104 Lecture Notes - Lecture 10: Analysis Paralysis, Data Model, Systems Development Life Cycle
31 May 2018
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Chapter 10- Info Systems Development
Q1: What is Systems Development?
- Also referred to as systems analysis and design
- Process of creating and maintaining info systems
- More than developing computer programs
- Which generally means just the software and maybe data and databases
- Systems development requires more than programming and technical expertise
- Systems development requires:
- Business knowledge and management skills
- Technical skills
- Non-technical human relations skills
- Interview skills, group dynamics skills
- Knowledge of business activities
- Skills to develop job descriptions and to train staff
Systems Development Versus Program Development
- Ifo sstes ae ee off-the-shelf ee though the softae opoet a e
- Info systems are a whole package designed around the goals of the system
- Remember that an info system includes the hardware and the procedures to fit the
business and the people who use the software
Q2: Why Is Systems Development Difficult and Risky?
- Many projects are not finished, over budget, over time or do not accomplish their goals
Q3: What Are the Five Phases of the Systems Development Life Cycle (SDLC)?
1. Systems definition
- Maageets stateet defies e sste
2. Requirements analysis
- Business knowledge used to identify features and functions
3. Component design (hardware, software and networks)
- Technical design based on approved user requirements
4. Implementation
- Implement, test and install new system
5. Maintenance
- Fix errors, add new features, maintain the system
Q4: How is System Definition Accomplished?
- Team of users and IS professionals assigned to identify the goals and assess feasibility
- A small business may hire a consultant to work with managers and key employees
find more resources at oneclass.com
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System Definition
o Define goals of the new system
- Defined to facilitate competitive strategy
- Supporting business processes, or
- Improve decision making
- Create quality relationships with quality customers
- Use those relationships to generate revenue
- How does the new system contribute to this strategy?
o Define system scope
- Defined by customers, users involved, business processes impacted, physical
location, functional area
o A clear definition of scope simplifies:
- Requirements determination
o Development work
o Assess feasibility
- Cost
- Appoiated, ak-of-the-eelope aalsis at this early stage
- Purpose: eliminate infeasible ideas as soon as possible
- Schedule
- Difficult to determine but a rough estimate is needed
- Technical
- Is the proposed system able to be built using existing info technology?
- Organisational
- Does the proposed system fit the customs, culture, charter and legal requirements of
the organisation?
Q5: What is the Uses ‘ole i the ‘euieets Phase?
- The requirements are specified based on business knowledge provided by users
Requirements Analysis
o Determine requirements
- Most important because if the requirements are poorly specified the system will fail
- Determine and document features and functions
- Interview users
- Document requirements
- Examine existing system
- Review reports, forms, queries, application features
- Identify security and control issues
- Consider all five components
- May involve the creation of a data model for a new database
- There may be corporate standards for hardware
find more resources at oneclass.com
find more resources at oneclass.com
Document Summary
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