6. Software Development

Question 1

what is the software development lifecycle (SDLC)

Answer 1

1. aim to produce high-quality software that really solves customer problem
2. 6 stages
   - planning: organise team, create road map, milestones, scope objectives
   - analysis: define requirements and customer approval
   - design: architecture, UI, framework, communications
   - development: writing software, documentation
   - testing: unit tests, system integration, user acceptance
   - maintenance: deployment, fixing bugs

Question 2

SDLC methodlogy

Answer 2

provide set of guide lines to follow for completing activities in SDLC process

1. models
2. techniques
3. tools

Question 3

models

Answer 3

abstract representation of real world
concepts
equation
diagram
charts

Question 4

techniques

Answer 4

a way of carrying out activities

1. requirement gathering
2. database design
3. project planning
4. software testing

Question 5

tools

Answer 5

integrated development environment IDE
computer aided system engineering CASE
drawing tools
communication tools

Question 6

SDLC approaches

Answer 6

1. predictive
   - planned and organised in advance
   - well understood, well defined
   - low technical risk
2. adaptive
   - flexible, modified in progress
   - uncertain requirements and needs
   - high technical risks

Question 7

Predictive flow

Answer 7

1. planning
2. analysis
3. design
4. development
5. testing
6. maintenance

linear sequential lifecycle model –> waterfall
extension of waterfall: V model

Question 8

Iterative Incremental flow

Answer 8

1. requirement
2. analysis
3. design
4. implementation
5. product increment 1
6. repeat…

used by agile development for adaptability and customer satisfaction

Question 9

predictive SDLC pro/con

Answer 9

pro
quicker working product
simple risk management
easier debugging and test

con
require good planning
needs clear and complete system definition
additional effort for system integration

used when
have clear requirements
high-risk features
adhere agreed scope

Question 10

adaptive SDLC pro/con

Answer 10

pro
cater for evolving requirements
better customer satisfaction
actively involvement and interaction from stakeholders

con
unclear planning
needs highly skilled, cross-functional team
off track if unclear vision

used when
end goal not clearly defined
fast process start required
experimental software is involved

Question 11

SDLC in practice

Answer 11

There are always some predictive and some adaptive elements

first understand the business
explore business environment, potential improvement by talking to manager…
document vision, business model, problems