On the other hand, we must also take into consideration the different scales of work trying to standardize the variables that we take to our field of study. This is why we must take into account the geographical, of accuracy, time scales (especially taking into account the differences between the timescale of the project and the timescale of succession of events in nature), etc. In general, the criteria for temporal and spatial identification of the scope of an EIA are: (already seen) legislative criteria. Previous studies that empirically mark the extent of impacts on projects similar to our study. Available information and fields of this information (as we have already seen for the differentiation between the physical and socio-economic fields). Need to homogenize the available information (such as many 2 or 3 fields present for one study) as much as possible. Statistical significance and scale of the data.
That the scope we choose will enable us to design a proper EIA. The cost and execution time. Other possible actions. Relationship between sources of similar scope in similar geographic circumstances, and which can give rise to synergies (cumulative. What that all is not the sum of its parts but something more). Inventory and environmental assessment. A. environmental inventory.
Definition and content. This task consists in knowing the affected environment and understand its operation. Its correct preparation depends largely on the quality of the rest of the EIA. You must select the appropriate variables, make an inventory of them, and make a synthesis and assessment of these. As any diagnosis has to contain: description of the current state of the system (pre-operational state). Interpretation of that State in the light of the causes that have led to it. Forecast of its evolution without action. This forecast can serve as a reference for the effects of the activity. Environmental assessment of the current situation and its evolution.