  This report describes the experiences of one organization's adoption of Test
Driven Development (TDD) practices as part of a medium-term software project
employing Extreme Programming as a methodology. Three years into this project
the team's TDD experiences are compared with their non-TDD experiences on other
ongoing projects. The perceptions of the benefits and challenges of using TDD
in this context are gathered through five semi-structured interviews with key
team members. Their experiences indicate that use of TDD has generally been
positive and the reasons for this are explored to deepen the understanding of
TDD practice and its effects on code quality, application quality and
development productivity. Lessons learned are identified to aid others with the
adoption and implementation of TDD practices, and some potential further
research areas are suggested.
