The study aimed at examining the role of the private firms in extension in Jordan, and the association between their characteristics and the methods of extension they use. Two thirds of firms were either partnerships or corporations, and half of them were organized in a professional association. Their technical staff is many times the staff of the public extension system. Low percentage of firms arranged for formal in-service training for their technical staffs. Firms mostly use multi-media and promotional approaches in extension methods. Many firms have experimental sites or links with local or international firms. Extension partnership is imperative between the public and private sectors to develop differentiated programs for serving its diversity of farmer’s needs. Merging firms into corporations and strengthening their professional association would enable firms to upgrade their services, experimental work, and in- service training. The quality of traded inputs has to be monitored to ensure fair dealing in business.