  Relativity was Einstein's main research program and scientific project. It
was an open-ended program that developed throughout Einstein's scientific
career, giving rise to special relativity, general relativity and unified field
theory. In this paper, we want to uncover the methodological logic of the
Einsteinian program, which animated the whole program and its development, and
as it was revealed in SR, GR, and unified field theory. We aver that the same
methodological logic animated all these theories as Einstein's work progressed.
Each of these theories contributed towards constructing Einstein's ambitious
program. This paper is not a paper in the history of Relativity, but, rather,
it utilizes our knowledge of this history to uncover the methodological logic
of the relativity program and its development. This logic is latent in the
historical narrative, but is not identical to it. We hope to show that the
Einsteinian relativity project is still relevant today as a theoretical scheme,
despite its failures and despite quantum mechanics.
