A strong focus on lighting quality and productivity as well as a renewed interest in energy efficiency in recent years has highlighted the lack of appropriate design guidance for architects, interior and lighting designers for creating glare-free daylit work environments, especially for offices. Well-developed design guidelines based on visual experience and careful monitoring of the design process from the start would likely go a long way in ensuring that daylit work environments are essentially glare-free. Extensive research on human vision and perception and innovation in architectural lighting design practice and technology have produced considerable opportunities for compiling a document aimed at providing useful design assistance for creating healthy and enjoyable work spaces. Work on a design guide is currently under way as part of the activities of the CIE Division 3 Technical Committee 3-39: Discomfort Glare from Daylight. It begins with the human visual senses and key parameters for describing and assessing visual environments. This paper outlines the approach taken and highlights the essential aspects considered.