The central role of modern experimental analysis is to help complete, through measurement and testing, the construction of a fully specified analytical model such as a finite-element model. In this paper, we demonstrate our approach on a rubber model undergoing large deflections. The inverse problem has two stages. The first is the parameter identification that determines properties such as material constants. The second involves the force identification for determining unknown loads. We formulate both inverse problems using the sensitivity response method (SRM). The advantage of the SRM is that it utilizes commercial FE programs and therefore there is essentially no restriction on the range of problems to which it can be applied. Experimental results using image data of the deformed model will be presented.