The document discusses the origins and development of language curriculum. It describes how curriculum development focuses on determining what knowledge and skills students learn and can be planned, measured, and evaluated. Language curriculum development refers specifically to applying these principles to language education. Key aspects of language curriculum development include selecting vocabulary and grammar content, determining the order they are taught, and evaluating language programs. A number of teaching methods were developed between the 19th-20th centuries as understandings of language learning evolved.