Ten test films were developed to measure aspects of children's visual perception which are difficult to assess through conventional paper and pencil tests. The film medium was selected because it allows the presentation of temporal, as well as spacial, aspects of the stimuli. Four areas of perceptual performance covered in the films are: (1) visual memory span, dealing with the quantity of visual material which the child can absorb and retain over a period of time; (2) the child's use of a space structure, or use of a spatial system within which all objects can be located at once; (3) space-time translation, requiring the child to integrate and interpret visual information about various forms, presented serially in the film; and (4) form perception, or the child's identification of a form in the presence of distracting or confusing details. Establishment of test validity may prove difficult, because of various factors which are discussed. (NH)