Patterns: Mediator vs MVC vs Session Facade?

[Kevin Thompson]

Maybe I have taken too many mock exams? These pattern questions all start looking the same to me. These three patterns have somewhat similar definitions in relation to "coupling" - to the point I don't know what reality is.??
For example - here are some questions I made up:
Question 01: What pattern can be used to promote loose coupling?
Select one of the following three patterns:
Mediator
Model View Controller
Session Facade
Question 02: What pattern can be used to correct tight coupling?
Select one of the following three patterns:
Mediator
Model View Controller
Session Facade
Question 03: What pattern can be used to prevent tight coupling?
Select one of the following three patterns:
Mediator
Model View Controller
Session Facade
What are other people's thoughts about this?
I was thinking the Mediator pattern is for "promoting loose coupling"(per GoF book), however, the "prevention" and "correction" of tight-coupling doesn't seem clear to me. It seems like any of the three could be a possible answer.
thanks!
Kevin Thompson

[Rufus BugleWeed]

Most people have a perfect score in patterns, or miss one of six. If you know them this well it's time to move on.
MVC and Session Fascade are not in the 23 anyway.

[Kevin Thompson]

MVC and Session Facade ARE on the exam. There are questions on the exam about loose coupling/tight coupling that have selections like I suggested above.
How do I know for a fact that these patterns are on the exam? Becuase I took the exam several months ago and failed, and these patterns were there.
I missed the question - because these patterns look alike to me.
In addition, there are a number of posts from people here and also on Yahoo saying that they also seen these patterns on exam.
Kevin Thompson

[Rufus BugleWeed]

How many of the six questions on patterns did you miss?

Did you read this post?
test distribution
[ August 20, 2002: Message edited by: Rufus Bugleweed ]

[SJ Adnams]

Even if you don't know what the patterns are, as long as you understand what 'coupling' is then you will be able to answer the questions.
MVC promotes loose coupling - it should be straightforward to change from a html based client to a java (thicker) client.
Mediator promotes loose coupling since objects cannot refer directly to each other.
MVC does not prevent coupling.
If you are trying to add an alternate client to a coupled MVC design then you could use a Facade pattern.