This practicum project involved working with four preschool children with mental disabilities to increase their cognitive abilities through the use of computer-based instruction and use of manipulative materials. It also sought to improve the children's social-emotional development and self-esteem. The developmental levels of the four students were determined, and appropriate cognitive objectives were chosen. Concepts taught included shapes, colors, letters, and numbers. Appropriate computer programs were selected to introduce the concepts and provide relevant practice, and manipulative activities were developed to provide tactile stimulation. Children were also provided with opportunities to sort, match, identify, color, paint, paste, sing, and dance about the concepts. The practicum successfully met its objectives. Appendixes contain surveys and questionnaires documenting the baselines and results of the practicum. (Contains 17 references.) (JDD)