In its ongoing assessment of information literacy competencies (ILC), CETYS Universidad first developed an in-house instrument and then applied the standardized tests, SAILS and iSkills. This paper analyzes the design of these instruments as well as data gathered from their implementation. This comparison aids in finding similarities in the ILC they measure, describe how they measure them, and study their differences. The objectives of this analysis are to describe the evolution of the Institution’s ILC assessment over the past four years while providing the basis for making an evidence-based decision about improving the in-house instrument and pushing to develop a Spanish-language multi-institutional tool, and/or the continued use of international instruments