THE free guided tours and the educational activities of the Urban Council Hong Kong Science Museum were a success - thanks to the voluntary workers who joined as docents last year. In recognition of their contribution, Urban Councillor Chiang Sai-cheong presented service awards to 38 outstanding docents. Speaking after the presentation ceremony, Mr Chiang said the science museum had introduced a docent training programme in 1992 with the aim of promoting better understanding of the operation and scientific principles of the exhibits. Since then, about 200 volunteers had been trained as docents. ''They are mostly science students or teachers, or professionals with a science background, who serve the community by working for the museum after school or after work,'' Mr Chiang said. ''In the past year, the docents have served more than 1,100 sessions, totalling 3,400 hours. They have conducted guided tours for some 30,000 kindergarten pupils and assisted more than 1,000 children to learn about science through simple and interesting fun experiments. ''During the highly popular dinosaur exhibition last year, the docents greatly helped visitors to have a better understanding of the exhibits. ''They had also assisted in science workshops and computer courses, freely passing on their scientific knowledge to participants.'' Looking into the future, there would be an increased public demand for museum services and the docents' scope of work would invariably become more diversified, he said. The existing guided tour services by docents are provided to visitors on Saturdays and Sundays at the science museum in three sessions. Visitors who wish to use this free service are required to register at the guided tour registration counter on the first floor of the museum. Docents are also stationed at the ''Life and Science Arcade'', ''Transportation and Communication'' and ''Energy, Food Science and Home Technology'' areas to explain the operation of the exhibitions on weekends.