Try to ask the question, do external inputs need more or less than 2 files to be processed? For all the EIs that reference more than 2 FTRs, all that is needed to know is if the EI has more or less than 4 data element types referenced. If the EI has more than 4 DETs the EI will be rated as high; less than 4 DETs the EI will be rated as average. Any EIs that reference less than 2 FTRs should be singled out and counted separately.