Obviously, although built starting from LCA stages, the framework can be  reversed by explicating it in relation to the design process phases. In this  way, the designers and practitioners’ comprehension is facilitated and  encouraged by the supporting tool developed with the aim to help them to design  and operate in a life cycle perspective. Indeed, for each phase of the design  process are pointed out: the LCA stages that can be taken into consideration; the  related LCA steps (sub-stages); i) the LCA information that can be gathered;  ii) the actors who can collect that data; iii) the sources where quantitative  information can be found and their relative units of measurement. Contrary to  the previous case, here only the quantitative data are taken into account since  they represent the type of information directly demanded by AEC firms to  develop an LCA study and therefore to bear in mind during the design process. Environmental  information are thus not reported, since they not depend to design practice,  but they can be attributed to database and/or EPD (when available) as well as  literature data or direct measurements, in relation to the phase of process and  the type of information in object. Given the amount and complexity of data  required to develop an LCA study, Figure \ref{457258} displays a limited part of the  conceptual framework enclosed to the only design phase of the process.