This paper summarizes the results of a quantitative review of the validity of the employment interview. It begins by discussing factors that make the interpretation of interview validity data difficult. The interpretation of interview validity data is shown to be hampered by the heterogeneity of constructs and measurement methods in the interview. It is noted that summaries of interview validity data are further complicated by the heterogeneity of occupations providing interview data. Despite these problems, the quantitative review draws several conclusions from the cumulated literature and details areas where knowledge is lacking. Conclusions are categorized as things known about the employment interview, things probably known about the employment interview, and things not known about the employment interview. The report ends with speculation on prospects for gaining future knowledge concerning the validity of the employment interview. (Author/NB)