The invention is concerned with a reliable manner of monitoring an injection process executed by means of a variable dose injection device with feedback means for generating a number of feedback events proportionate to the dose to be determined. A dialed or injected dose is determined by measuring a first signal of the process comprising a first signal peak related to a feedback event； detecting the first signal peak in the first signal； selecting an evaluation interval comprising the detected peak and adapted to an expected peak duration； deriving, from the first signal limited to the evaluation interval, a feature or characterizing parameter of the feedback event； identifying, from the derived feature, the feedback event as one of a dial up, dial down, or expel feedback event, and counting the number of identified feedback events to determine the dialed or the ejected dose. The two-stage approach with serially executed peak detection and peak identification separates an initial localization of a signal peak possibly related to a feedback event from a subsequent analysis of the detected signal peak in view of a possible source or origin feedback event, and allows to optimize data storage and processing power requirements.
