New techniques often involve innovative approaches and looking at the problem they address from a different perspective: OO will be of heavy impact of the software construction. The technological shift from classical development and structured methods to evolutionary development and object-oriented methods is certainly not easy. We must given it the time and the means in terms of structures, training, staff, and support for all to come effective. C,S has joined several R&D projects to test if and how Object Orientation can be applied to its software. We share here our considerations on OO development and the understanding obtained through practical experiences within the CMS object oriented activities and the RD41 (Moose) project
