Fourth Normal Form (4NF) entity-relationship diagram for a software company database separating multi-valued dependencies into distinct junction tables. EMPLOYEE, EMPLOYEE_SKILL, PROJECT, and EMPLOYEE_PROJECT tables model employees, their programming skills and languages, assigned projects, and project-employee relationships with proper primary and foreign keys. This normalized design eliminates data anomalies and redundancy while maintaining referential integrity across one-to-many and many-to-many relationships. Fork this diagram on Diagrams.so to customize table structures, add additional attributes, or export as .drawio or .png for documentation. The separation of Skill and ProgrammingLanguage into EMPLOYEE_SKILL demonstrates 4NF compliance by isolating independent multi-valued facts.