PPT Slide
Noun/Class Type Definition/Description
OnLineBookStore role The entire system
Customer role External stimuli for the system
Book tangible Books to be sold
MusicCD tangible CDs to be sold
Software tangible Computer S oftware Systems (CDs)
Notice that a number of the items you would expect to find for an online merchant are not defined as of yet. Futher the attributes of the objects are not included.