ISO 28564-3:2019 specifies requirements and gives a range of guidelines for various stages of preparation, design, construction, inspection and updating that comprise an information index signs used in public places.

This document is applicable to the design and use of information index signs used in public places such as bus and railway stations, airports, shopping centres, stores, hospitals, exhibition halls, sporting and entertainment complexes, urban areas, parks, gardens and countryside, public attractions, museums and commercial office buildings. The design and use of information index signs in working areas can also use the content of this document for reference.

This document is not applicable to those sectors (for example, traffic signs on a public highway) which are subject to regulations or specified design principles. However, in a given public environment or within a wayfinding and signing design brief, where there is sometimes a need for public information to be associated with other messaging, many of the principles contained in this document can be relevant in the planning of a coordinated scheme.