Hi Bob, Michael, Thomas and all other just to make sure that you understood me correct. I have totally no problem to answer questions to newbies, even "basic" questions. In fact working at a university implies to answer a bunch of (sometimes even "low-end") questions every single day. No problem at all. ;) As I said, I'm more a reader to this list (due to the fact, that the MEMS in not my main topic). Therefore, you are all right, that I can just ignore these messages. I just believe that people should investigate a little bit more time to ask on this list. Independent of the background and knowledge everyone is able to ask in a normal polite manner. Furthermore, an email-list like this could be a valuable knowledge-base (that's the reason I follow this list) for everyone but only if questions and answers allows readers to understand and follow what was discussed. However, I know I can not change it and the topic will (as mention already) pop up again and again in future. Maybe a wiki could help to do the job a little better. Those who like to help and to share experience could create detailed articles, receipts and How-To-docs on this wiki and the list could be used to discuss things in more detail. This will not prevent some people to ask still "three-line" questions. However, at least you could give a "three-line" answer then Dear Friend Please read the wiki [link]. Best regards Just my two cents and please I don't want to start a flame war. Furthermore, it was not my intent to offend someone personal. Very best regards to all of you Torsten