(23)Resolution planning is an essential component of an effective resolution process. Resolution authorities should therefore have all the information necessary to identify critical functions and ensure their continuation. Insurance and reinsurance undertakings have privileged knowledge of their own functioning and any problems arising from it, and resolution authorities should therefore draw up resolution plans on the basis of, inter alia, the information provided by the undertakings concerned. In order to avoid unnecessary administrative burdens, resolution authorities should primarily retrieve the necessary information from the supervisory authorities.