The rapid development of technology and science has led to the development of the education world today. One effort to improve education and learning quality is inseparable from the role of educators in implementing appropriate and efficient learning media that can support learning to improve students' cognitive development. One of the media that can be used is to utilize mobile learning applications. M-learning can make learning different because teachers and students can access learning, direction and applications related to learning wherever and whenever. It will make the learning process more interesting, increase attention to the material. The purpose of the research was to develop a mobile learning application to improve students' cognitive development. The research method was used namely Research & Development using ADDIE (Analysis, Design, Development, Implementation, and Evaluation) models. The results of this study indicated that mobile learning could improve students' cognitive development.

The purpose of this research is to analyze students’ personality traits and language learning strategies at the tenth grade students of SMK N 9 Padang academic year 2016/2017. Design of this study is descriptive qualitative. There are 25 students at the tenth grade of SMK N 9 Padang was becoming the respondents of this study which were chosen by stratified random sampling technique. The data was collected by using Big Five Inventory and Strategy Inventory for Language Learning version 7.0 (SILL) questionnaires. As the result, it found that there are various characteristics of the tenth grade students of SMK N 9 Padang academic year 2016/2017 are extraversion, agreeableness, conscientiousness, neuroticism and openness.  In addition, each of personality traits used different learning strategies where extraversion and agreeableness students use affective strategy, meanwhile, conscientiousness, neuroticism and openness use metacognitive strategy.