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Description: Working memory is a central structure for cognition which allows two essential functions: the storage of a small amount of information and the processing of information. Some working memory models suggest that storage and processing functions are not independent and share common resources. In our study, we want to investigate how people coordinate these storage and processing functions when they have to perform them in a dual-task at their individual span level. We will use a complex span task, which is often use to assess working memory. Firstly, participants will perform a titration task which measures their span in single tasks of storage (memorization of letters) and processing (parity judgment task). Then, they will perform the single tasks at span to measure their percentage of correct responses in each task. Finally, they will perform dual-tasks, in which each letter to be memorized will be followed by a processing task of 6 seconds. The principal purpose of this study is to assess a composite score of the capacity to coordinate these two tasks (storage and processing) at span in a complex span task.