  This document aims to estimate and describe the effects of the social
distancing measures implemented in several countries with the expectancy of
controlling the spread of COVID-19. The procedure relies on the classic
Susceptible-Infected-Removed (SIR) model, which is modified to incorporate a
permissiveness index, representing the isolation achieved by the social
distancing and the future development of vaccination campaigns and allowing the
math model to reproduce more than one infection wave. The adjusted SIR models
are used to study the compromise between the economy's reactivation and the
resulting infection spreading increase. The document presents a
graphical-abacus that describes the convenience of progressively relax social
distancing measures while a feasible vaccination campaign develops
