In 2020, the U.S. Census Bureau will conduct the decennial census to enumerate the U.S. population, with a mission of counting everyone once, only once, and in the right place. In preparation for this challenge, the Census Bureau is carrying out various research activities, including the 2014 Census Test. Language research being conducted in 2014 includes translating census questions and census materials into multiple non-English languages. Spanish, as the most commonly spoken non-English language in the United States, has been chosen to be included in the 2014 Census Test. In order to ensure that the Spanish-language 2014 Census Test materials are grammatically correct, culturally appropriate, and technically sound, the Census Bureau convened a panel of expert reviewers to provided detailed, informed feedback on the terminology used in these translations and their usability by monolingual Spanish speakers who would likely respond to the 2020 Census online. This report documents the review process and recommendations made by the experts.