The diagrams in Weibull++ allow you to build reliability block diagrams (RBDs) using blocks that are linked to calculated data sheets from life data and life-stress data folios.
One typical application for this tool is for performing complex failure modes analysis. As explained in the Competing Failure Modes (CFM) Analysis topic, the CFM analysis method that is built-in to the Weibull++ life data folio assumes a series reliability model and uses only one type of distribution to analyze all the modes. If the situation is more complex, an RBD analysis method must be used instead (see Using RBDs for Failure Modes Analysis).