In the summer of 2003, a survey was carried out at the At-Bristol Science Centre (UK) to determine the effectiveness of the hands-on activities of "Explore". The section evaluated included 43 interactive experiences divided into two themes. The first, "Get Connected", consisted of examples of the latest digital technologies, such as a television studio, virtual volleyball, and radars. The second, "Curiosity Zone", was dedicated to natural phenomena and subdivided into three additional groups: "Natural Forces" which presented various forces of nature, "Focus on Light", which dealt with the wonder of light, and "Sound Space", reserved for the science of sound. The survey was divided into two phases: the first consisted in observing the public's interaction with the hands-on activities; the second, in consulting the staff. The methods adopted helped determine the effectiveness of the exhibitdesign and the evaluation itself highlighted the role of a promoter of science as an evaluator.