It has become common for technology to be seen as an effective tool to solve public problems. Thus, knowledge-intensive public policies have been found in technological instruments as the best ally to achieve their objectives. This paper explains how technological and political orders are co-constructed in the trajectory of public policy against tax evasion in Ecuador. On the one hand, the socio-technical controversies of the design of policy instruments since the creation of the Internal Revenue Service (IRS) are addressed. On the other hand, it analyzes how technical knowledge translates the different understandings of the public problem and the economic interests embedded in the political sphere.