  The recent concept of {\em relativistic positioning system} (RPS) has opened
the possibility of making Relativity the {\em general standard frame} in which
to state any physical problem, theoretical or experimental.
  Because the velocity of propagation of the information is finite, {\em
epistemic relativity} proposes to integrate the physicist as a real component
of every physical problem, taking into account explicitly {\em what}
information, {\em when} and {\em where}, the physicist is able to know. This
leads naturally to the concept of {\em relativistic stereometric system} (RSS),
allowing to measure the intrinsic properties of physical systems. Together,
RPSs and RSSs complete the notion of {\em laboratory} in general relativity,
allowing to perform experiments in finite regions of any space-time.
  Epistemic relativity incites the development of relativity in new open
directions: advanced studies in RPSs and RSSs, intrinsic characterization of
gravitational fields, composition laws for them, construction of a
finite-differential geometry adapted to RPSs and RSSs, covariant approximation
methods, etc. Some of these directions are sketched here, and some open
problems are posed. \end{abstract} \noindent I want the organizers of this
seminar, Dirk P\"utzfeld and Claus L\"ammerzahl, to know how much I appreciated
their inviting me to talk about my ideas on this subject. It is also a pleasure
to thanks the Wilhelm und Else Heraeus-Stiftung for their kind hospitality.
