This publication is the third one in a series with this title. It discusses building models-classifications of non-additive properties (sustainability) of soils and landscapes. Examples of classification models for integrated sustainability assessment of soil and landscapes based on the current scoring system are given. The authors offer classification models on the basis of an integrated indicator of sustainability constructed on the principles of ASPID-methodology (Analysis and Synthesis of Parameters under Information Deficiency). Refs 22. Tables 8.