The PIANC Guidelines for the Design of Fender Systems: 2002 (WG33) is to be replaced by an updated document, PIANC Fender Guidelines 2024 (WG211). With the preparation and development of PIANC WG211, the issues that should be considered when selecting a fender system deserve as much attention as the design of any other element of the structure of which it is a part. This paper describes the fender selection process as outlined in Chapter 6 of PIANC WG211. The guideline provides background information on the range of factors influencing fender system selection, including estimating key aspects of vessel geometry, assessing multiple fender system contacts, and determining how the design vessel(s) is likely to interact with the proposed fender system. PIANC WG211 introduces the term ‘Base Fender Performance’, and this paper includes an overview of the detailed guidance now provided on the method to calculate and apply the relevant correction factors. It includes a new correction factor associated with accounting for the effect of multiple fender system contacts and the application of partial resistance factors now adopted for the selection of fenders, related to determining fender design performance. This paper also provides details on the updates to design guidance associated with factors affecting hull pressure, including the effect on the selection of fenders and the sizing of fender panels. This paper will provide designers, and others involved with the selection of fenders and fender systems, with a comprehensive overview of the revised and updated guidance, considerations and methodologies now included within WG211.@en