Schengen Evaluation Guide
Article 26
The Commission, in close cooperation with the Member States, shall establish and, if necessary, update guidelines on, in particular: (a) training responsibilities of experts, the Commission representatives and observers; (b) preparatory activities for evaluations; (c) conducting visits, including unannounced visits; (d) conducting evaluation and monitoring activities, including by questionnaire or, exceptionally, by other remote methods; (e) drafting process and the inclusion of documentary and digital material in evaluation reports; (f) follow-up procedure, in particular regarding revisits and verification visits; (g) synergies with other evaluation and monitoring activities; (h) logistics and financial issues relating to the organisation of evaluation and monitoring activities; (i) the verification of the activities of the Union bodies, offices and agencies insofar as they perform functions on behalf of the Member States to assist in the operational application of provisions of the Schengen acquis .