This symposium was the first conference held specifically for biological control of arthropods and follows the successful model of four-yearly symposia for biological control of weeds. Attendance was limited to 250 people with only a single session to maximise participation and exchange of information. It was an excellent opportunity to hear the latest research developments in several relevant areas, including the use of molecular methods to estimate predation, the use of alternative habitats to conserve natural enemies and the effects of Bt crops on beneficial insects. My current project investigates the ecology of key predators and their impact on Helicoverpa populations. At present an ELISA system is being tested and this system will be used to quantify predation on Helicoverpa armigera in cotton. However this area of research is changing rapidly with new techniques under constant evaluation and development.