Notes on System Design / SDLC

Question 1

SAD

Answer 1

Systems Analysis and Design

Question 2

Why SAD?

Answer 2

Installing a system without planning leads to dissatisfaction and problems. SAD provides structure to the analysis and design of information systems.

Question 3

System Analyst : Role

Answer 3

Must be able to with people of al descriptions and be experienced in working with computers.

Question 4

Systems Development Life Cycle (SDLC)

Answer 4

Phased approach to solving business problems, and developed through the use of a specific cycle of analyst and user activities.

Question 5

UX Factor

Answer 5

Demand for analysts who are capable incorporating UX (user experience) into SAD keep increasing.

Question 6

Seven Phases of the Systems Development Life Cycle

Answer 6

1. Identifying problems, opportunities, and objectives.
2. Determining human information requirements.
3. Analysing system needs.
4. Designing the recommended system.
5. Developing and documenting software.
6. Testing and maintaining the system.
7. Implementing and evaluating the system.

Question 7

Modelling process (real world problem)

Answer 7

1. Informal Model - the portion of the real life that we want model, and how it will work (input and output and main components in plain English).
2. Conceptual Model - using an established technique for data analysis (entity-relationship).
3. Logical Model - rendered using established, formal techniques (definition of the tables of a relational database).
4. Physical Model - implemented by means of a programming language (MySQL or SQLite)