Marques, A.I., Maria João e Ma Rosa, M.  Amorim, P.  Soares, A.  Oliveira-Tavares, Rui  Santiago, J.  Mota, and J. F.  Carvalho. ?Study Protocol: Using The Q-Steps To Assess And Improve The Quality Of Physical Activity Programmes For The Elderly?. Bmc Research Notes 5. Bmc Research Notes (2012).