The objective of this paper is to describe the divergences in the participation of WTO country members in Specific Trade Concerns and disputes in relation to sanitary, phytosanitary and technical measures (SPS/TBTs) according to their income level. For this, data was compiled and synthesized from the WTO I-TIP and Dispute Settlement Gateway databases for the period 1995-2012. This data was then grouped according to the development level of the member(s) involved, using the World Bank annual classification (high income country, upper-middle income country, lower-middle income country and low income country). The results obtained evidence that the participation of WTO members in the mechanisms considered has been very diverse, according to their economic level; with high income countries much more active than developing and least developed countries.