Understanding the relationship between the kinetics of cellulose degradation and a painting’s tensile properties is essential for extrapolating useful indications on the work’s expected lifespan and the correct methodology for planning the most suitable conservation treatments. The author proposes “evaluation parameters” that permit informed comparisons, starting with clearly defined methodological approaches. The kinetics of cellulose degradation are a key factor, as they give a reliable time factor for conservation choices, seen together with other factors such as the microclimate surrounding the work.