At Openfares we follow these principles when developing your custom solution:

• Our highest priority is to satisfy the customer
  through early and continuous delivery
  of valuable software.
• Welcome changing requirements, even late in
  development. we 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.
• Process promotes 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.