Some notes from the first two lecutres

Three "S":

• Services - what industry is selling; are provided by
• Systems - package of different interacting software
• Software - by creating the software we create some system

Three "P":

• People - we, with different background
  
• Project
• Process

Software can have various

• function
• application area (e.g. university or a private company)
  
• operation mode (e.g. how many users at a time)
• scale (e.g. how many lines)
• data representation (e.g. database type, file types)
• software criticality
• software stability
• software product availability
  
• computer system and environment
• computer resource requirement
• security requirement
• reliability requirement

Triangle for "product"
- size = functionality
- quality
- time
-> this is the reason why we still have problems like during the 'software crisis' ('60)
-> NATO Conference 1969 recommends standardization of the software development process

Triangle for "quality"
- process (as skeleton to help people with different backgrounds;p)
- tools
- people

Sofware processes are in the development phase of the software life-cycle. - ?!

Evolution of s. process models:

• Code-and-fix model ('50)
  
• Stagewise model (from stage to stage, '60)
• Waterfall model ('70)
• Evolutionary model, Transform model, IID (~'80)
• Spiral model ('80/'90)
• Agile development, XP (~2000)

Types of development

1. Plan driven development - document-driven, code-driven, traditional; emphasis on defining the scope, schedule and costs upfront;
   
2. Change-driven development - aim of enabling evolution of product requirements during process of software development; adoption of IID approach;

• Iterative development - often resulting as a internal iteration release (IIR), a stable, integrated, tested partially, complete system; each iteration may considered as a mini-project, produces a subset of the final system;
• Incremental development - adding functionality to the system over several releases to the market; one incremental delivery may be composed of several iterations;
• IID - when the system is developed in several iterations; often called just iterative development;p

NOTICE: in IID increments consist of several iterations each, not the opposite!

* Iterative development - many waterfalls; XP - plenty of waterfalls ;p