Lennart Carlsson, PhD, is a senior researcher, affiliated to the Section of ‘Family Medicine and Primary Care’ at the Karolinska Institute. His research is focused on the Essence of Multimorbidity and its consequences at the first tier of care. Lennart has been following the development of the ACG System during 25 years and he was the one that introduced it into Swedish Primary Care. His dissertation in 2005 highlighted the ACG System in a Swedish setting for the first time.