We have, over the last 21 years, worked hard to produce the best quality tours possible. To do this, we believe in rigorous evaluation of our methodology, and the impact that our work has on our audiences. On many occasions we have worked closely with external evaluators, who have undertaken evaluation for us. When this has not been possible we have conducted internal evaluations. These evaluations provide insight into the achievements of projects, both in terms of achieving original objectives, and achieving outcomes not originally predicted, but none-the-less valuable.