After reviewing the conceptual bases and practical application of precision teaching, this analysis traces its evolution as the Sacajawea Plan, reports on its implementation in central Oregon school districts, and details the costs and procedures of adoption. Developed by Ogden Lindsley from B. F. Skinner's work in operant conditioning and extended through the Applied Behavioral Analysis methodology, the Great Falls Sacajawea Project comprises: (1) a screening procedure to identify students with basic academic skill deficiencies; (2) a means of continuously measuring student performance in basic skills necessary for learning; (3) a method for charting daily performance; (4) techniques for making decisions from charted performance; and (5) instructional support. The Great Falls Demonstration Project evaluated the effectiveness of precision teaching through a controlled study of six schools, and the project's developers concluded that the techniques produce statistically significant results inexpensively and are helpful to special and regular education students regardless of economic level. Interviews with Oregon teachers who participated in implementing precision teaching techniques in mathematics and reading instruction confirm that charting procedures were generally less rigidly followed after the initial year. Cited as factors in successful implementation are teacher dedication, administrative support, and economic conditions. Sample charts are appended. (MJL)