The development of interactive displays has transformed the traditional museum world in the last decade. Visitors are no longer satisfied by simply gazing at worthy displays in glass cases - they expect to have hands-on experience of the objects and be actively involved with the exhibits, learning informally and being entertained simultaneously. Hands-on museums and science centres provide the most remarkable example of how museums are redefining their roles in society - improving access to real objects and real phenomena, so that they can be enjoyed by more people. Tim Caulton investigates how to create and operate effective exhibitions which achieve their educational objectives through hands-on access. He concludes that the continuing success of hands-on museums and science centres hinges on attaining the very best practice in exhibition design and evaluation, and in all aspects of operations, including marketing and financial and human resource management.