According to several researches conducted by several organizations,
such as Ministry of Education (MOE), Institute for the Promotion of Teaching
Science and Technology (IPST), and National Institute of Educational
Testing Service (NIETS), it was found that most Thai students did not
succeed in learning mathematics in terms of content and mathematics
processes. This research results were consistent with the facts and findings
of several surveys which were conducted based on the situation happening
in real life. Therefore, problems in learning mathematics could be concluded
in 3 significant points, including (1) mathematical problem solving ability,
(2) mathematical communication ability, and (3) mathematical connection
ability. The purposes of this research included (1) to develop a mathematics
instructional model by integrating problem-based learning approach and
collaborative learning approach to enhance mathematical problem solving,
communication, and connection abilities of sixth grade students, and (2)
to study the effects of the use of the instructional model.