You don't need to know the details/differences stratagies form the SCWCD point of view. All you need to know is given the scenario/requirement(asked in a bit complicated english though
), what sort of design pattern will you implement.
But the stratagies details will help you in practical development.
Ram Dhan Yadav (SCJP, SCWCD, SCJA-I, IBM EC(483))
"We are what we repeatedly do. Excellence, then, is not an act, but a habit."