In this paper, we highlight the Alternative Enumeration (AE) methods used in the Ethnographic Evaluation of Behavioral Causes of Census Undercount Project. We focus on the research phase for "resolving" differences in the match between the AE and Census records. We compare the population counts obtained from Alternative Enumerations to those keyed from census questionnaires and to the constructed "resolved" population of sample areas. Measurements of coverage error further compare the population as enumerated on census forms to the population "resolved" to have been resident on Census Day.