A package of interventions for enhancing effective use of the textbook structured for increasing academic learning time is composed of i) distribution of textbook, teachers' guidebook and exercise book, ii) in-service teacher training, iii) mentoring of mathematics class of teachers by headmaster, iv) review of teaching practice of mathematics. 2nd and 7th grades are targeted for this evaluation. Regarding the 7th grade, as all the junior secondary schools in El Salvador receive the distribution of textbooks and teachers' guidebook of mathematics newly developed, and all the teachers receive in-service training on the use of textbook, the effectiveness of intervention of distribution of exercise book for increasing learning time at home, and that of mentoring and review of teaching practice for changing teachers' behavior will be identified.
Teachers' guidebooks and exercise books are designed, corresponding to each page and topic of textbook. In-service teacher training is conducted for 2 days, and the contents are presentation of composition of the textbook, and demonstration and practice of mathematics class using the textbook. Trainings for headmaster and representatives of parent association are conducted for half a day, and cover the composition of textbook, the method of mentoring and sensitization of importance of learning at home. Review on teaching method of mathematics is conducted for 3 times a year. Teachers bring the result of test of their students conducted at the end of each trimester, and discuss and analyse for improvement of students' learning.