dear ali I has hear that you can ***** software. I have a 45 days trial of design-expert 7.1 this program is used in experimental design procedure to optimize simulation and experiments. would u plz ***** this siftware. your accompony is so appreciated. here is the dl link of the software. [url=http://www.4shared.com/file/90697959/35157e5/Design-Expert_71-_45_Days_Trial.html]4shared.com - online file sharing and storage - download Design-Expert 7.1- 45 Days Trial.rar[/url] best regards