The environmental assessment procedure has limitations. It provides a means to analyse and quantify, in order to optimise or benchmark. If detailed system analysis is not essential to achieve the preferred outcome, it will not be warranted. A more general approach recognises that study limitations may prevent detailed data acquisition on the material inputs and outputs of processes. If this is the case, the approach in Australia as in Europe (European Commission, 2006) has been to fall back on the waste hierarchy.