SAP R/3: parameters controlling

Dear,

I'm a jobstudent at NV Niko and I have to do some

research to introduce new features about SAP.
It is about inventory controlling : parameters controlling.
For certain

articles, I can access the parameter controlling and for exemple get the bar chart of the Lot size.
The bar takes place at

a certain range of coverage at the average receipt and value of the average receipt. Now I have a few questions about this

topic:
Are these 2 variables determined by SAP or is it possible to change them and try to optimize?
In the chart, the

bar has a specific place, is their a possibility to see what the perfect place would be? By perfect place I mean in which

segment should the lot size be in the optimum for a specific article. Maybe their is a function to see this.
How can we do

follow-up-analyze-actions? For exemple, when we select more than 1 article, is their a possibility to take out the bad ones

(these that are not in their optimum) and that way spot and improve them?
For the safety stock, I have the same problems,

so I hope you can help me with these too.

Thank you

Best regards,

Dieter Vonken