Value assessment, an important element of the pre-market evaluation of pest control products at the Pest Management Regulatory Agency, consists of three components: assessment of efficacy (or the ability of the product to fulfil its claims), of economic benefits & competitiveness, and of the product's contribution to sustainability. The guidelines presented in this document apply to the evaluation of efficacy of chemical control products for plant protection. The first part outlines general principles for conducting efficacy trials and meeting efficacy data requirements. The second part describes test procedures for generating efficacy data. The final part provides guidance on the reporting & preparation of the efficacy data package for presentation to the Agency.