The present document provides guidance on the preparation of Protection Profiles (PP) based upon ETSI communication standards. A PP defines an implementation-independent set of security requirements for a category of communications equipment which is subject to evaluation under the Common Criteria (CC) scheme described in the multipart ISO/IEC 15408 [7].The detailed contents of a PP are specified in ISO/IEC 15408-1.  The use and applicability of the CC to the ETSI standardization process is described in EG 202 387 and further guidance on the implementation of security-related standards in telecommunications equipment is specified in  ES 202 383. Throughout the present document, a worked example of a Protection Profile (PP) for TETRA Direct Mode Operation (DMO) security is used as an illustration. A partially complete PP for TETRA DMO security can be found in annex B.  Conformance to the present document is established by successful evaluation to the requirements of ISO/IEC 15408-3.