Emphasizing critical thinking skills in the curriculum of higher education institutions is needed to produce graduates with higher order thinking skills. Given the importance of information technology for critical thinking in learning, it is necessary to understand the key factors related to learning designs that utilize information technology in their learning environment and consider the pedagogical and information technology alignment. This study aims to describe the process of analysing, designing, and developing interactive learning videos as part of the redesign of the multivariable calculus course to support students’ critical thinking skills. This paper will describe the lessons learned from and the next steps in this research and development process.

There are five mathematical skills that students must have in one of them is problem-solving. The implementation of problem-based blended learning is expected to demonstrate differences in problem-solving skills that are given problem-based learning blended learning and students who are given conventional learning. It is also known that there are interactions between the initial mathematical ability (KAM) and the learning model of problem-solving capabilities so that this is the purpose of this research. The research was conducted in the private junior high school Imelda Medan with the total population of students in the junior high school. And the research samples amounted to 60 students consisting of two classes, the experimental class and the control class. The results showed that there was a difference in problem-solving skills between students who were given learning-based blended learning and students who were given conventional learning. The student problem-solving capability in the experimental class has a higher average of 78,53, compared to an average control class of 71,56. Then there is the KAM interaction and learning model of problem-solving capability with F hitung value of 3,766 and its significance of 0,029 < 0,05.

State University of Medan (red-Unimed) has provided Learning Management System (LMS) for lecturers and students namely Sistem Pembelajaran Daring (Online Learning System) that is abbreviated Sipda. But before using Sipda, lecturers must prepare teaching materials and provide appropriate learning resources. Objectives of this study were to describe the effectiveness of teaching materials based "Activity or Resources" at Sipda Unimed in the mathematics education study program and also to describe changes in learning behavior of students in mathematics education study programs using teaching materials based "Activity or Resources" at Sipda Unimed. This study used Research and Development design with 4-D model. The subjects of this study were students of mathematics education at their third semester who are taking multivariable calculus course. Result of teaching materials validation scaled one to four score showed the average is 3,78. Result of response questionnaire scaled one to four score showed the average is 3,72. Result of learning behavior scaled one to four score showed the average is 3,82. Result of analysis data showed that teaching materials based on "Activity or Resources" on Sipda Unimed are effectively used and have an impact on enhance students learning behavior

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