The present invention relates to a method for measuring at least one inhalation flow feature in an inhaler, wherein a capsule containing a formulation is located in the inhaler, the method comprising the steps of sensing an impact feature relating to impacts of the capsule on the inhaler and correlating the impact feature to at least one inhalation flow feature. The present invention also relates to an inhaler adapted to aerosolize a formulation contained in a capsule, wherein the inhaler comprises a sensor for sensing an impact feature relating to impacts of the capsule on the inhaler and a processor for correlating the impact feature to at least one inhalation flow feature. The present invention also relates to a system comprising an inhaler adapted to aerosolize a formulation contained in a capsule and a computing device external of the inhaler, wherein the inhaler comprises a sensor for sensing an impact feature relating to impacts of the capsule on the inhaler and a data-receiving-transmitting means to receive and transmit data from and to the external computing device, wherein the external computing device also comprises data-receiving-transmitting means to receive and transmit data from and to the inhaler, wherein the inhaler and/or the external computing device comprises processing means for correlating the impact feature to at least one inhalation flow feature.
