The purpose of this study was to perform research on the development of core course textbooks in the LIS field. The process of textbook development proposed in this study can also be a useful reference for developing the textbooks for other, non-core courses. The textbook development procedure used was as follows; 1) investigating and analyzing the main textbooks of LIS core courses domestically and abroad, 2) deriving optimal curriculum content from job analysis results, 3) gathering comment and feedback from professors teaching core courses, 4) proposing a final, three-tiered table of contents for an optimal textbook. The textbook table of contents proposed as a result of this research relates to the core subjects of: Introduction to Library and Information Science, Information Services, Library Management, Information Organization, Information Retrieval, and Library Fieldwork. We suggested chapter and section levels for all subjects, and list all of the details that should be dealt with in each section; instructors are then able to select from these options at their discretion.