This guidance note is the first of a series of guidance notes prepared by UN Environment’s United for Efficiency (U4E) initiative. The series intends to assist policymakers in developing and emerging economies who have or are currently considering transforming their market to energy-efficient products. The guidance notes aim to support the development of product registration systems and in particular web-based product registration systems, an essential element in the support and efficient delivery of such programs. The focus of the notes lies on cooling products (primarily refrigerators and air-conditioners), though the product registration system framework is also capable of supporting the inclusion of other product categories (e.g. lighting, washing machines, electric motors).