The current repository contains the materials, raw behavioral data, and analysed data for the project described in the manuscript "Decoding the content of working memory in school-aged children" by Nora Turoman, Prosper Agbesi Fiave, Clélia Zahnd, Megan T. deBettencourt and Evie Vergauwe. The repository has three components: 1. *Experiment*, which contains the experimental materials. 2. *Raw data*, which contains behavioral data before cleaning and analyses (EEG data before cleaning and analyses are contained in https://zenodo.org/record/8425759) 3. *Analysis and Results*, which contains the codes used to clean and analyse the behavioral and EEG data, the clean behavioral data (the clean EEG data is stored in https://zenodo.org/record/8425851), and the results. The specific files in each component are described in the Wiki of each component, unless otherwise stated (e.g., in Raw data, the details are in a readme file instead). The Zotero repositories each contain a readme file describing the specific files therein.