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The question of the determination of the proton charge radius $R_p$ fromelectron scattering data led to an unprecedented experimental effort formeasurements of the electric form factor of the proton at low and very lowmomentum transfer in electron and muon elastic scattering. On the basis ofbasic properties of densities and fitting bias considerations, a procedure isdeveloped in order to evaluate the impact of forthcoming data on $R_p$.Particularly, it is shown that a 0.1\% precision on these future cross sectiondata is necessary to establish indisputably the $R_p$-value as determined fromlepton scattering. The ProRad (Proton Radius) experiment at the PRAE (Platformfor Research and Applications with Electrons) facility in Orsay is furtherdiscussed, especially the experimental method to meet this stringentconstraint.

Merits and constraints of low-${\bm K^2}$ experimental data for the proton radius determination