CONTENT AND LANGUAGE FEASIBILITY COMPONENT OF PHYSICS TEXTBOOK BASED ON IVM REPRESENTATION TO TRAIN CRITICAL THINKING SKILL OF VOCATIONAL STUDENTS.

Aim: the objective of this article is to describe content feasibility and language feasibility physics textbook based on IVM representation to train critical thinking skill vocational students. IVM representation stands for image, verbal, and mathematical representation which is one of multirepresentation approach variation. This research is a development research. Content feasibility can be seen from the logic validation of three validator to physics textbook based on IVM representation, and supported by empirical validation in the form of improvement of students\' critical thinking skill. Language feasibility can be seen from the logic validation from three validator to physical textbook based on IVM representation, and supported by empirical validation in the form of legibility of textbook. Based on the data got,content feasibility covers alignment with Core Competency and Basic Competency, lesson, alignment with student development and society need, knowledge substance, and life skill, insight to advance and work out, and deverse of social value, it is seen from logic validation that has enough category. Empirical validation shows that critical thinking skills for four indicators, namely analysis, inference, interpretation, and evaluation are in high category. Language feasibility that includes readability, conformity with good and correct Indonesian language rules, and language logic has a value of 80.56% and categorized as valid. Empirical validation with legibility test included in the high category, so that the language feasibility physics textbook based on IVM representation is considered feasible.