Abstract: The invention relates to a method for monitoring a space that can be accessed through a control door (1), said method being characterised in that it comprises: i) monitoring the opening of the door (1); ii) as soon as a minimal opening of the door (1) occurs, powering a first monitoring means (2) and a second monitoring means of a first monitoring area (4) and a second monitoring area (5), and carrying out the following steps in a continuous and simultaneous manner up to the closing of said control door (1): determining if one or no or several persons have crossed the first monitoring area (4); determining if the second monitoring area (5) has been crossed; iii) taking into account this information for determining if the passage is compliant and unitary. The invention also relates to a control door for implementing said method.