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It is now generally agreed that very accurate measurements of the Z, W, top and Higgs properties (so-called EWSB parameters) will allow the sensitivity to new physics to be extended to higher energy scale. For example, a new energy scale of 1 TeV would translate into deviations of the Higgs boson couplings to gauge bosons and fermions of up to 5\% with respect to the standard model predictions~\cite{cite:ILCTDR}, with a dependence inversely proportional to the square of the energy scale. The Higgs boson couplings therefore need to be measured with a per-cent accuracy or better to be sensitive to 1 TeV new physics, and with a per-mil accuracy to be sensitive to multi-TeV new physics. Similarly, the precision of the W and top mass measurements need to be reduced by at least one order of magnitude, and the precision of the Z pole measurements by two orders of magnitude to provide a meaningful closure test of the standard model, with sensitivity to multi-TeV weakly-coupled new physics.  Among the various proposals of Higgs factories (pp colliders, $\epem$ colliders, $\mu^+\mu^-$ colliders, or $\gamma\gamma$ colliders), it turns out that only circular $\epem$ colliders can deliver the integrated luminosity deemed adequate to reach such precisions. The TLEP proposal~\cite{cite:TLEP}, which would be hosted in a new 80 to 100 km tunnel in the Geneva area, would be able to produce collisions at centre-of-mass energies between $m_{\rm Z}$ and 350-370 GeV at several interaction points, and make precision measurements at the Z pole, at the WW threshold, at the HZ cross section maximum and at the $\ttbar$ threshold with an unprecedented accuracy. This collider is also the only project with a possible upgrade to a hadron collider in the same tunnel, at a centre-of-mass energy of 100 TeV, which would give access to new physics up to scales of 10 TeV or more.