This is a hands-on, practical guide to describe field trials in oil palm. The location for field trials is key, as is land preparation. Other logistics include the germination of seeds from crossing programmes, planting in a nursery and well-grown seedlings for field planting. The trial design needs to be translated into field lay out. Field planting is a critical point requiring plant care, good labelling, field lining and a system of checks, and must be timed to the rainy season. Recording of trials starts 1 year after planting for crown disease assessment and continues for yield approximately 30 months after field planting. Growth measurements also begin 30 months after planting. Tests for oil yield and quality are carried out one year after yield recording.