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The article presents cluttering as understood as a specific communication disorder. Cluttering has received less coverage in the subject literature than stuttering and is comparatively poorly understood. Defining cluttering presents us with a problem due to differences of opinion as to which of the behaviours associated with the disorder are crucial to its diagnosis and which are rather peripheral. Modern approaches to the understanding of cluttering should be based on a neurodevelopmental concept, which has pointed out the importance of understanding the whole symptom formation from genes to behavior. This model has microgenetic theory itself in the backround. It includes distal interactive factors (genes, environment), main interactive factors (speech planning and speech production), modeling factors (cognitive processes and awareness), and behaviour itself (cluttering). The article discusses these factors against the basis of the global subject literature. Particular attention has been devoted to the development of the process of becoming aware of mistakes in utterances within the perspective of the state of the brain/ mind in time. The section ends with a discussion of the diagnostic criteria including that of differential diagnostics.