The “intangible” effects are defined as the costs of natural hazards which are not, or at least not easily measurable in monetary terms. In this context, this background paper reviews and analyzes the cost-assessment of the human health and the environmental effects of the natural hazards. This Work-package aims at compiling and analyzing the methods for the assessment of the intangible effects and at providing recommendations for their most effective application. The compilation and the analysis of the cost-assessment methods is based on a state-of-the-art literature review and will consist the basis for the hazard background papers and the hazard workshops to be carried out in ConHaz. Summarizing the content of the WP3 background paper it presents the physical context of health and environmental impacts caused by the four different natural hazard types analyzed under the ConHaz project. Also it presents and compiles the cost-assessment methods of the intangible effects by providing in detail their application context. Furthermore, the data availability and use process is evaluated. Eventually, this background paper analyzes in a qualitative way the application of the cost-assessment methods and provides preliminary recommendations.