Probing the neutrino mass matrix in next generation neutrino oscillation experiments

We review the current status of the neutrino mass and mixing parameters needed to reconstruct the neutrino mass matrix. A comparative study of the precision in the measurement of oscillation parameters expected from the next generation solar, atmospheric, reactor and accelerator based experiments is presented. We discuss the potential of $0\nu\beta\beta$ experiments in determining the neutrino mass hierarchy and the importance of a better $\theta_{12}$ measurement for it.