In this paper, a process to ensure that infrastructure is managed so that levels of infrastructure related risk due to natural hazards are acceptable, is presented. This is the proposed within Work Package 4 of the European Research Project “Novel indicators for identifying critical infrastructure at risk from natural hazards (INFRARISK)”. It consists of three main tasks, 1) initiate, 2) conduct stress tests, i.e. determine if there are acceptable levels of infrastructure related risk due to natural hazards, and, 3) construct intervention program, i.e., determine the risk reducing interventions to be executed to reduce the risk to acceptable levels. The process is described making appropriate references to four principles of systems engineering, a) follow a basic structured process for solving problems, b) work in phases, c) work from a high level to a low level of abstraction, and d) think in multiple possibilities. Emphasis is given on the second of the three main tasks: conduct stress tests. The process can be used for a wide range of natural hazards, infrastructure networks and at many different levels of abstraction. It can be used with and without computer support, and can take into consideration both simple and complex system representations.