Abstract: There is disclosed a computer-implemented method for facilitating estimation of the effect on a technical system of at least one type of risk to the system, each type of risk having a characteristic defined at least partly by a parameter, and the method comprising: for each type of risk: selecting a plurality of values of the parameter that defines the characteristic of the type of risk; and for each of the selected parameter values: generating an estimate of a numerical effect on at least one state, resource requirement or output of the technical system for the present type of risk having the selected characteristic parameter value; generating an estimate of a likelihood of occurrence of said numerical effect; and processing the pairs of estimated numerical effect and estimated likelihood of occurrence to generate a mathematical function having an input corresponding to a parameter of the type of risk and an output corresponding to an estimated numerical effect and a corresponding estimated likelihood of occ