first two applying principal qualifiers. Correlating the map scale levels with concrete scales is difficult because selecting a map scale level depends very much from the homogeneity/heterogeneity of the landscape. The principal qualifiers are added before the name of the RSG following the rules explained for naming a soil. Depending on the purpose of the map or according to national traditions, at any scale level, elective qualifiers may be added. They may be additional principal qualifiers from further down the list and not already used in the soil name, or they may be supplementary qualifiers. They are placed using the above-mentioned rules for supplementary qualifiers; principal qualifiers first, then supplementary qualifiers. The WRB recommends that on a map unit not just one soil is indicated but an association of soils. For this purpose, WRB uses the following nomenclature: dominant: the soil represents ≥ 50% of the soil cover, codominant: the soil represents ≥ 25 to < 50% of the soil cover, associated: the soil represents ≥ 5 to < 25% of the soil cover. Soils representing smaller areas are ignored in the denomination of the map unit. For codominant and associated soils, it is allowed to use less principal qualifiers than would correspondent to the used map scale level. The use of specifiers is not recommended due to the generalization that is required when making maps. In map legends, the names of the RSGs are given in plural; in all other cases they are given in singular. The WRB Manual The WRB Manual comprises seven chapters and six annexes. Chapter 1 reports on background and basics. It includes tables of the diagnostics and of the RSGs. The latter is given below. Chapter 2 provides the rules for naming soils and creating map legends. It starts with the definition of some general terms in WRB, like ‘fine earth’ and ‘whole soil’. It is highly recommended to read this short chapter before using the WRB. Chapter 3 presents the diagnostic horizons, properties and materials, each with a general description, the diagnostic criteria and some additional information. For the decision, whether a diagnostic is present or absent in a soil, only the diagnostic criteria are relevant. Chapter 4 provides the key to the RSGs and for every RSG a list with the available principal and supplementary qualifiers. Chapter 5 gives the definitions of the qualifiers. Chapter 6 provides the codes for the RSGs,