Here are some thought about the important question frequently raised - and we are not brave enough in to go into details. Large organisation are facing with the issue of complex "hairball" architecture, which is not performing well. Frequently the changes, which entitled to fix the performance results more issues and even worse performance. Performance: this case it could mean all the business aspects, including reposnse times, TCO, time-to-market and so, finally the aspect of Ability to change.