AEQ is analyzed. Factors which must be considered in selecting physical

measures for analysis in any given case include: the nature of the pro­

duction processes and raw materials used; the financial and labor resources

available for installation and operation; the existence of alternative

technological options from foreign sources; possible barriers to the pur­

chase of foreign technological options; the extent to which a particular

physical measure is considered politically, socially, economically fea­

sible, e.g., can be implemented; and the available analytical resources.