The purposes of this research were to study the lesson plans by the application of Thinking Tools, to study the effectiveness index of the lesson plans, and to study the satisfaction with the lessons. 135 samples were the third year students majoring in Social Studies under the Educational College, Roi-Et Rajabhat University in the academic year 2013. The research instruments consisted of 10 Lesson Plans, Achievement Test with the discriminative power ranging from 0.28-0.96, and Satisfactory Questionnaire containing 12 items of question with the criminative power ranging from 0.47 to 0.76 and with total-deleted reliability at the 0.90. The statistics was percentage, mean, standard deviation, and effective index. The findings of this research were found that there were 10 lesson plans consisting of ten thinking ways: Key Question, Walk and Talk, Thing Pair Share, Round Robin, Mind Mapping, Jigsaw, Hug Thinking, Place Mats, Card and Chart, and Hot Ball. The lesson plans by the application of Thinking Tools had the effectiveness index at 0.80 values. Lastly, the third year students satisfied with the lessons by the application of Thinking Tools at the highest level.