CU1 PROG4

It is a methodology that is typically

used to develop, maintain, and replace

information systems for improving the

quality of the software design and

development process.

7 Types of SDLC Models (Enumeration)

> the process moves in a cascade mode

> Each stage has concrete deliverables

>strictly documented

>next stage cannot start before the previous one is fully completed

> another linear model with each stage

having a corresponding testing activity

> implies exceptional quality control

> one of the most expensive

> time-consuming models

> puts focus on thorough risk assessment

> need to engage people with a strong background in risk evaluation.

> A typical Spiral iteration lasts around 6 months and starts with 4 important

activities - thorough planning, risk analysis, prototypes creation, and

evaluation of the previously delivered part. Repeated spiral cycles seriously

extend project timeframes.

> working in close collaboration both across the team and with the

customers

It is probably the most popular Agile model. The iterations (‘sprints’)

are usually 2-4 weeks long and they are preceded with thorough planning

and previous sprint assessment. No changes are allowed after the sprint

activities have been defined.

a typical iteration lasts 1-2 weeks. The

model allows changes to be introduced even after the iteration’s launch if

the team hasn’t started to work with the relevant software piece yet.

Such flexibility significantly complicates the delivery of quality software.

To mitigate the problem, XP requires the use of pair programming, test-

driven development and test automation, continuous integration (CI),

small releases, simple software design and prescribes to follow the

coding standards.

its key distinguishing feature is the absence of

pronounced iterations. If used, they are kept extremely short (‘daily

sprints’). Instead, the emphasis is placed on plan visualization. The team

uses the Kanban Board tool that provides a clear representation of all

project activities, their number, responsible persons, and progress. Such

increased transparency helps to estimate the most urgent tasks more

accurately.