The time-based resource-sharing model (TBRS) was developed as an attempt to integrate and synthesize the findings issued from a series of studies inspired by the thought-provoking ideas of J. N. Towse and G. J. Hitch. The TBRS model is implemented in a working memory cognitive architecture in which a central system is in charge of both the maintenance and the transformation of working memory representations. In the TBRS model, the peripheral sensory stores are conceived as passive in nature. In the TBRS model, a major source of forgetting lies in the temporal decay of memory traces. Within the TBRS model, as in most working memory models, the challenge in examining the rate of forgetting is to prevent attention from reactivating memory traces. The TBRS model makes clear that temporal factors are particularly important to account for working memory development. The theoretical framework provided by the TBRS model proved heuristic in investigating the sources of the development of working memory.