Creating ex-outs in national nomenclature may serve to address the former problem, but not the latter. Experts tend to agree that for the vast majority of renewables, dual use is a function of their ubiquitous nature, whereby they can be employed for uses other than environmental. Therefore, using ex-outs to “drill down” to single use from dual use does not seem a viable option (OECD, 2006). This problem has led to disagreements among trade negotiators as well as between customs authorities and traders, to the point that some analysts are questioning the relevance of the Agreement and the technological assumptions it was based on.39 If there is an overall lesson to be drawn from the ITA and other sectoral agreements, it is that ex-outs have been - and should remain - the exception rather than the rule.