most important, next to the connection to gravity, is the ability to stabilize the electroweak scale and predict the gauge unification. With R-parity conserved the lightest superparticle (LSP), in many models the lightest neutralino $\tilde{\chi}^0_1$, is a candidate for the main constituent of cosmological cold dark matter (DM). In fact the data from WMAP and astrophysics/cosmology [@WMAP] can already put constraints on many possible supersymmetric models. For example, within the constrained MSSM (cMSSM - often referred to as mSUGRA) with universal scalar ($m_0$) and gaugino ($m_{1/2}$) masses and universal trilinear ($A_0$) scalar couplings at some unification scale, the dark matter data (and low-energy and collider constraints) select a thin strip in the $m_0$-$m_{1/2}$ parameter plane, shown in fig.\[fig:cmssm\](a), in which $\mu>0$, $A_0=0$ and $\tan\beta=10$ [@Heinemeyer:2004xw]. A scan of the cMSSM parameter space gives a broader band, as shown in the plane of the lightest visible (LVSP) and the next-to-lightest visible (NLVSP) superparticle masses, see fig.\[fig:cmssm\](b); the LSP itself was considered not to be visible [@Ellis:2004bx]. This figure gives an impression that most of the points (in this specific model) are outside the reach of the ILC. However, at the ILC in most cases the lightest neutralino $\tilde{\chi}^0_1$ will clearly be 