In an experiment whose purpose is to model the interruptions phenomenon and its impact on tasks achievement, we show that in some cases, such as temporarily interrupted realisations of cooking recipes, the popular ACT-R knowledge representation approach cannot offer a model that is highly close to the natural human behaviour. We emphasize the incapacity of ACT-R to reproduce correctly the recall of information in a temporal context to achieve properly the action plan for a recipe realisation after a momentarily interruption. We propose an alternative knowledge representation theory, which uses additional knowledge structures that are inspired from the human memory, to faithfully reproduce a usual human behaviour in resuming correctly suspended activities.