This study aims to describe and explain the value of Sellingman's optimism contained in the novel Disorder by Akmal Nasery Basral so that it can be used as Indonesian language teaching material in high school. The method used in this study is a qualitative descriptive method. The data in this study are in the form of words, phrases, clauses, sentences, and paragraphs that contain information about the value of Sellingman's optimism in the novel. The structural approach is used as a scalpel because it is used to describe the findings in the novel structure. The validity of the data used is investigator triangulation. Data analysis resulted in finding the presence of Sellingman's optimism value in Novel Disorder in the novel, namely permanence, pervasiveness, and personalization.

The research and development is aims to develop and describe the effectiveness of worksheet based on Quantum learning to improve the ability of critical thinking students. The type of research used is research and development that refers to the theory of Borg & Gall. The population of this research is the students of 5 th grade of Elementary School in North Metro. The sample of this research was 33 students in 5 th grade class A of Elementary School 1 North Metro. Data were collected used questionnaires, observation sheet and test questions. Data were analyzed using N-Gain effectiveness test. The results showed that worksheet based on Quantum learning is feasible to use and effective to improving the ability of critical thinking students.