  In 2017, Duminil-Copin et al. introduced the OSSS method to study properties
of diverse percolation models. This document aims to introduce the reader to
this new method. It contains a introduction to percolation theory, then
concentrates on the case of Poisson-Boolean percolation. The majority of this
document is dedicated to an detailed analysis of [DRT18]. This work is the
result of an internship in Summer 2019 with Jean-Baptiste Gou\'er\'e at the
University of Tours.
