Varia Vol. 120, 2020/2 - 132 pagesContentsPages 99 to 101Introduction to the special issue. The development of working memoryBy Valérie CamosTheoretical notesPages 103 to 134The evolution of working memoryBy corresponding author Frederick L. Coolidge, Thomas WynnPages 135 to 156Why and how to study working memory developmentBy Nelson CowanResearch articlesPages 157 to 174The rate of forgetting over time in working memory during early childhoodBy Raphaëlle Bertrand, Izabela Stan-Zahno, corresponding author Valérie CamosPages 175 to 202Children’s working memory develops at similar rates for sequences differing in compressibilityBy corresponding author Fabien Mathy, Ori Friedman, Nicolas Gauvrit, Alessandro Guida, Michaël FartoukhPages 203 to 229Core mechanisms underlying the long-term stability of working memory traces still work in agingBy Gabriel Jarjat, Gaën Plancher, corresponding author Sophie Portrat