시스템 분석 및 실습 참고자료

USE CASE DIAGRAM

http://www.guides.sk/UML/describe_uml_tutorials/Describe_documentation_pdf/C++Tutorial/Chapter_4-_The_User_Case_Diagram.pdf

http://www.math-cs.gordon.edu/local/courses/cs211/ATMExample/UseCases.html

http://www.saspin.org/SASPIN_Feb2001_Van_Epps.pdf

http://www.wilsonmar.com/1usecase.htm