This report summarizes the Specialized Teacher Project of the Miller Mathematics Improvement Program funded by the state of California. The project provides inservice training workshops in mathematics for elementary school teachers. These teachers are then encouraged to provide specialist instruction in mathematics for their own class and one other class at the same grade level by means of a trade-off of teaching assignments. The objectives and procedures for these workshops are included, and three phases of the 1969-1970 research are reported. Phase One examines the cost effectiveness of varying the instructor participant ratios in the workshops. Phase Two compares the achievement of classes for different socio-economic levels of the communities involved. Phase Three compares pupil achievement of classes taught by teachers who commuted to workshops with those taught by teachers who resided on campus during the workshops. Results of the three analyses are reported. Teacher training had a positive effect on pupil achievement in mathematics, particularly in grade two in low socio-economic areas. For a related document, see ED 047 950. (JH)