Concentration is a sine qua non or hallmark of a Montessori programs. Yet, it happens that some children do not concentrate. They do not engage with the materials in the classic pattern of normalization. They are not challenged by A.D.H.D. or a variant of Sensory Integration Spectrum Disorder. Instead of concentrating in the classical way, they prefer the company of others; they prefer to learn with others. We may wonder if their natural intelligence is interpersonal. Based on findings from ethnographic research and studies of brain development, we will explore a type of attention called shared focus and re-examine the central role concentration has played in our Montessori philosophy. Then we will identify 33 classroom strategies for guiding children to concentration.