Team Accelerated Instruction, Initials And Problem-Solves Ability In Junior High School

This research aims to test the effectiveness of the Team Accelerated Instruction (TAI) towards the ability of the students to solve math ematics problems based on the ir  initial abilit y . This study is an experiment with 367 students involved as the research sample taken using the cluster  technique. The research variable is the problem-solving ability, the initial ability , and the learning model. A nalysis of variance was used to analyze the data which leads to the conclusions that (1) the TAI is more effective than the  Direct Instruction (DI) ; (2) the students having moderate initial ability performed better compared to the low er and the high er initial ability ; (3) among the students with moderate initial ability , TAI  was more effective to be used than  DI ; and (4) in the implementation of  TAI and DI , the problem solving ability of the students is relative ly similar.