Mae pob dosbarth â set o ymddygiadau a argymhellir yn ogystal â set o reolaethau amddiffynnol. Mae'r rhain yn gymesur â phroffil bygythiad y dosbarth dan sylw ac effaith bosibl unrhyw fygythiad, colled ddamweiniol neu ddatgeliad anghywir o’r wybodaeth a gedwir o fewn y dosbarth hwnnw.
Each tier provides a set of recommended behaviours and a set of protective controls. These are proportionate to the threat profile for that tier and the potential impact of a compromise, accidental loss or incorrect disclosure of information held within that tier.