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As the pertaining energy scale is yet unknown, new colliders are in order to try to pin down their origin. The path towards the choice of the right machine(s) to achieve this goal can be enlightened by the successes of past History. Between the late 70's to the early 90's, precision measurements of neutral currents first led to the prediction of the W and Z masses; the W and Z were then discovered at the CERN S${\rm p\bar p}$S at the predicted masses, and the CERN LEP measured the gauge sector properties with precision. Similarly, in the 90's, the precise measurements of the gauge sector led to the prediction of the top quark mass, later discovered at the FNAL Tevatron at the predicted mass, and in the last decade, the precise measurements of the W mass at the FNAL Tevatron led to the prediction of the Higgs boson mass, later discovered at the CERN LHC at the predicted mass. To continue this success story, the next facility should be a able to nail down all the Electroweak Symmetry Breaking parameters, towards a prediction of the new physics energy scale. The next-to-next following  facility would then aim at discovering this new physics directly with access to much larger centre-of-mass energies. The This vision is fully in-line with the  recent update of the European Strategy, approved at the end of May by the CERN Council, does not say anything different. Council.  To proceed with the choice, choice of the next large scale accelerator complex,  the following questions must be answered: \begin{itemize}  \item What parameters must be measured and with what precisions ?  \item What energy scale should be aimed at to directly look for new physics ?  \item What are the accelerators to optimally achieve these goals, and what is how does it compare with  the potential of (HL-) LHC (HL-)LHC  ? \item When is the decision to be taken ?  \end{itemize}  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, example in Beyond Standard Models such as SUSY,  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:1305.6498}, which would could  be hosted in a new 80 to 100 km tunnel in the Geneva area (Fig.~\ref{fig:TLEP80}), 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 (called VHE-LHC) 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.