One area explored in the second (in-depth) phase of the Learning in Science Project was "children's science," defined as views of the world and the meanings for words that children have and bring with them to science lessons. The investigation reported focuses on the concept of "light" held by 36 students. Data were obtained during individual interviews in which students were shown cards with diagrams representing either light sources (such as candle, sun) or light reflectors (such as moon, mirror). Student responses are presented, discussed, and analyzed in separate sections representing key questions asked: (1) Does the object make light? (2) Does light travel and if so how far? and (3) How is it that the person is able to see the (candle)? Responses are categorized within each section by major patterns noted during analyses. The second question was further explored by means of surveys administered to Form 2 (N=144) and Form 3 (N=235) students. Implications for science instruction, based on such findings as few students understanding that light must travel into the eye to enable us to see objects, are discussed. (Interview cards and survey used, additional student responses, and percentage of correct survey responses are included in appendices). (JN)