Summary : This paper deals with Best Practices in the context of an internet-based information sharing system for practitioners of Sustainable Agriculture and Natural Resources Management. It is meant for potential and actual users of InterSard: Organisations involved in actual field work in Sustainable Agriculture and Natural Resources Management. The paper is meant to explain the concept of Best Practices and explain the work involved and the information needed for generating and drafting Best Practice descriptions. The main objective of the InterSard system is to document and systematize information on actual (field-work) efforts towards Sustainable Agriculture and Natural Resources Management. By enabling colleagues (both in our own organisations and in a wider audience) to consult summaries of the results of our earlier efforts, we can create a creative learning environment, and help generate new ideas. Making information on actual field-work accessible for like-minded organisations or individuals in a searchable form would prevent unnecessary duplications of efforts, repetitions of mistakes. It would enhance the efficiency and effectiveness of promotion and extension efforts of Non-Governmental Organisations (NGOs) and government (extension) agencies.