Commentaries: Art. 16

Any person who requests information from the controller as to whether personal data relating to him or her are being processed must do so in writing. If the controller agrees, the request may also be made verbally.
The information shall be provided in writing or in the form in which the data is available. By agreement with the controller, the data subject may inspect his or her data on site. The information may be provided verbally if the data subject agrees.
Information may be requested and provided electronically.
The information must be given to the data subject in a comprehensible form.
The controller must take appropriate measures to identify the data subject. The data subject is obliged to cooperate in the identification process.