The article deals with theoretical and methodological position and experience of an integrated approach in the assessment of the status of water ecosystems and geosystems and their emergent properties. It is specially noted the place of the integral assessment in the study of the state of eco-and geosystems and problems of constructing models of classifications for assessing the condition of the properties and functions of geosystems. It is discussed model classification integrated assessment of productivity of water objects on the composite indices method and principles of ASPID-methodology (analysis and synthesis of parameters under information deficiency).