Software developement

Made with help from PMT Comp. Sci. notes

The 5 developement methodologies you need to know

• Waterfall lifecycle

• Agile methodologies

• Extreme programming

• Spiral model

• Rapid application development

Waterfall lifecycle

• Includes analysis, design, implementation, evaluation and maintanance

• Linear process - the stages are completed in sequence

• Phases can be revisited back in turn

The 5 developement methodologies you need to know

• Waterfall lifecycle

• Agile methodologies

• Extreme programming

• Spiral model

• Rapid application development

Waterfall lifecycle

• Includes analysis, design, implementation, evaluation and maintanance

• Linear process - the stages are completed in sequence

• Phases can be revisited back in turn

Extreme programming

• Programming stage is main focus

• Is a form of agile developement

• Includes planning, design, code, test

• Testing is focused throughout developement

• Prioritises code quality over documentation

• Encourages the use of pair programming

Spiral model

• Incremental design

• Includes planning, design, programming and evaluation

• At the end of all 4 phases it repeats

• Each phase usually adds a new element to the problem

• Is used to manage risk

• Prioritises riskiest elements first

Alpha testing

• Testing by the developers

• Testing in the way the end user would

• Used when the program is complete

• Takes place before beta testing

Advantages of a modular approach

• Work is easier to divide between a team

• each team member just needs to know what values go into their subroutine and the expected functionality

• Saves time as work takes place in parallel

• each team member can work on their area of expertise.

• Breaks problems into smaller area

• Easier to test/ debug/ read

• Each subroutine can be tested before integration.

• Code can be reused in the project/ future projects