Specifically, the framework is developed to interrelate design process  with LCA pointing out for each phase of the process: i) the information required  to develop an LCA study; ii) the actors engaged to gather that type of  information; and iii) the related tools and sources used to take data. To face  the complexity of the system and to handle the large amount of data, LCA  standards were taken as starting points, gathering first of all the complete  list of information required to perform the inventory phase of an LCA study.  Hereafter, for each information is explained: i) the design process stage that  can deal with that type of data; ii) the actors who can collect the  information; and iii) the sources and tools where information can be taken. In  this way, as shown in Figure \ref{608984}, the framework becomes more manageable, being  organized in a flow chart that show in order: on the left side, the list of  data taken from LCA standards and, on the right side, the additional part where  the information required are explained also with the relative units, specifying  the design stage, the actors and the source and tools concerning quantitative  and environmental data. Indeed, it is important to underline that in a LCA  study the inventory phase represents the most demanding phase of the analysis, given  the large amount of information required split up in two distinct type:  quantitative data and environmental data. For instance, the amount of concrete  kilograms located in the building (quantitative data) is associated with the  corresponding emission in air, with the raw materials extracted, and so on  (environmental data), representing the elementary flows in inputs and in  outputs between the technosphere and the ecosphere. The consistency and the  variety of this type of information significantly affect the level of  completeness of the study and their quality affects the reliability and  accuracy of the results.