Software Development

A short story about

Waterfall development

  • Finish a step before moving to the next

  • You do not revisit a previous step

  • It can take a lot of time to deliver

  • You better do it right before moving forward

Can we do it better?

The Agile Manifesto

The 17th of February of 2001, 17 people meet and proposed an alternative...

They proposed values and principles

But instead of a new process

  • Individuals and interactions over processes and tools
  • Working software over comprehensive documentation
  • Customer collaboration over contract negotiation
  • Responding to change over following a plan



Our highest priority is to satisfy the customer
through early and continuous delivery
of valuable software.

Welcome changing requirements, even late in
development. Agile processes harness change for
the customer's competitive advantage.

Deliver working software frequently, from a
couple of weeks to a couple of months, with a
preference to the shorter timescale.

Business people and developers must work
together daily throughout the project.

Build projects around motivated individuals.
Give them the environment and support they need,
and trust them to get the job done.

The most efficient and effective method of
conveying information to and within a development
team is face-to-face conversation.

Working software is the primary measure of progress.

Agile processes promote sustainable development.
The sponsors, developers, and users should be able
to maintain a constant pace indefinitely.

Continuous attention to technical excellence
and good design enhances agility.

Simplicity--the art of maximizing the amount
of work not done--is essential.

The best architectures, requirements, and designs
emerge from self-organizing teams.

At regular intervals, the team reflects on how
to become more effective, then tunes and adjusts
its behavior accordingly.

And then, we got some implementations...




Agile methodologies in the real world


  • 4 chairs

  • 3 always occupied

  • 1 always available

  • To talk, occupy one chair

  • Someone needs not stand up