Standard SD Pricing Procedure

Following is the link to the Standard Pricing Procedure used in SAP, just check out if you have worked on each condition type and do you understand the formulas attached to each condition type.


http://spreadsheets.google.com/pub?key=phixAHJ6iFNOBn91F1vkFHg .
In addition to this we tend to lack concept and fall apart when we go into detail. Do we really know how pricing works: Let us discuss the following points, each one of them, just to know do we understand the concept used behind pricing in SAP:
1 What is the concept behind condition technique, why do we have a determination concept, what benefit do we get using this concept?
2 Why do we determine pricing be assigning it to the Sales Area , OR type and CPP
3 Can one pricing procedure control the pricing of an entire enterprise , if yes/no why ?
These are just the basic conceptual questions which many of us might be knowing, but whats more important here is how we express , do we know how to express what we know , if u do pl let all of us know through your comments.