List of Tables List of Figures Chapter 1 Introduction 1.1 Motivation 1.2 Goals of the Book 1.3 Outline of the Book Chapter 2 Previous Research 2.1 Introduction 2.2 Analysis of Textbooks 2.2.1 Motivations for Textbook Analysis 2.2.2 Corpus Analysis of Textbooks 2.3 Lexical Diversity and Lexical Coverage 2.3.1 Lexical Diversity 2.3.2 Lexical Coverage and Word Lists 2.4 English Education in Japan 2.4.1 Policies 2.4.2 Practices 2.5 Conclusion Chapter 3 Materials and Methodology Used to Analyze Vocabulary in Japanese EFL Textbooks 3.1 Introduction 3.2 Constructing the JESTR Corpus 3.2.1 Procedures for Textbook Selection 3.2.2 Description of Junior High School Textbooks and Texts 3.2.3 Description of Senior High School Textbooks and Texts 3.3 Research Design and Text Preparation Procedures 3.3.1 Design and Goals of the Study 3.3.2 Procedures for Text Scanning and Cleaning 3.3.3 Procedures for Text Identification and Splitting 3.3.4 Proeedures for Text Tagging and Lemmatization 3.4 Analysis Procedures 3.4.1 Measures of Word List Presentation and Coverage 3.4.2 Analysis of Word List Presentation and Coverage 3.4.3 Measures of Lexical Diversity 3.4.4 Analysis of Lexieal Diversity 3.5 Conclusion Chapter 4 Results 4.1 Introduction 4.2 Research Question 1 4.3 Research Question 2 4.4 Research Question 3 4.4.1 Research Question 3a 4.4.2 Research Question 3b 4.5 Research Question 4 4.5.1 Research Question 4a 4.5.2 Research Question 4b 4.6 Conclusion Chapter 5 Discussion 5.1 Introduction 5.2 Examples of Vocabulary 5.3 Implications