Abbreviation for Suspect, Know, You. A standardized Zone Comparison Technique test format that is included under the umbrella of the Backster Zone Comparison Technique. In a structured format, the S-K-Y allows for broadening of the scope of a single-issue test to include questions relating to secondary involvement and knowledge. Along with the questions addressing direct involvement, such as “Did you shoot Henry Jones?”, other moderate strength relevant questions could be used, such as “Do you know for sure who shot Henry Jones?” or tertiary issues such as those that place the examinee at the crime scene, address his alibi, or tests prior knowledge. The S-K-Y is rarely used today.