Software Development Methods

Introduction
Lately I’ve been noticing that it’s not that common to understand the different software development methodologies that are being used in the field. So this post is to provide you with a quick overview.

“A software development methodology or system development methodology in software engineering is a framework that is used to structure, plan, and control the process of developing an information system.” Source : Wikipedia

Waterfall (Traditional)
The waterfall development model originates in the manufacturing and construction industries; highly structured physical environments in which after-the-fact changes are prohibitively costly, if not impossible. Since no formal software development methodologies existed at the time, this hardware-oriented model was simply adapted for software development. The waterfall model is a sequential design process, often used in software development processes, in which progress is seen as flowing steadily downwards (like a waterfall) through all the phases.
Waterfall_model_(1).svg
More info : http://en.wikipedia.org/wiki/Waterfall_model

RUP (Iterative)
The Rational Unified Process (RUP) is an iterative software development process framework created by the Rational Software Corporation, a division of IBM since 2003. RUP is not a single concrete prescriptive process, but rather an adaptable process framework, intended to be tailored by the development organizations and software project teams that will select the elements of the process that are appropriate for their needs.
Development-iterative
More info : http://en.wikipedia.org/wiki/Rational_Unified_Process

RAD (Spiral)
Rapid application development (R.A.D) is a software development methodology that uses minimal planning in favor of rapid prototyping. The “planning” of software developed using RAD is interleaved with writing the software itself. The lack of extensive pre-planning generally allows software to be written much faster, and makes it easier to change requirements.
RADModel
More info : http://en.wikipedia.org/wiki/Rapid_application_development

XP (Agile)
Extreme Programming (XP) is a software development methodology which is intended to improve software quality and responsiveness to changing customer requirements. As a type of agile software development, it advocates frequent “releases” in short development cycles (timeboxing), which is intended to improve productivity and introduce checkpoints where new customer requirements can be adopted.
XP-feedback
More info : http://en.wikipedia.org/wiki/Extreme_Programming

SCRUM
Scrum is an iterative and incremental agile software development framework for managing software projects and product or application development. Scrum focuses on project management institutions where it is difficult to plan ahead. Mechanisms of empirical process control, where feedback loops that constitute the core management technique are used as opposed to traditional command-and-control management. Its approach to planning and managing projects is by bringing decision-making authority to the level of operation properties and certainties.
Scrum_process.svg
More info : http://en.wikipedia.org/wiki/Scrum_%28development%29
(Another method named “Kanban” is oftenly associated with SCRUM, yet there are subtle differences!)

Closing Thoughts
Be aware that there is NO silver bullet… Each method has its own advantages and disadvantages. Be sure to study each one before choosing the right on for YOUR team. It’s not because SCRUM worked with a given team for project Z, that it will for another team that’ll code project Y. (Be aware of cargo cult!)

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Scrum & XP from the Trenches

Henrik Kniberg and InfoQ.com offer a free version for download of the book “Scrum & XP from the Trenches“.

This book includes:

  • Practical tips and tricks for most Scrum and XP practices
  • Typical pitfalls and how they were addressed
  • Diagrams and photos illustrating day-to-day work
  • Testing and test-driven development
  • Scaling and coordinating multiple teams
  • Dealing with resistance from inside and outside the team
  • Planning and time estimation techniques
  • Forwards by Jeff Sutherland and Mike Cohn

I’ve enjoyed reading the book and must say that I can recommended it to anyone interested in Scrum!