This article discusses walk-throughs as a valuable source of instructional data for teachers and administrators. Data gathering and analysis can be a dynamic and exciting process when walk-throughs are incorporated into a school's improvement plan as an instructional snapshot. At Norris High School in Firth, Nebraska, the principal uses walk-throughs to regularly monitor how teachers are using identified instructional strategies to improve student achievement in reading across the curriculum. This practice has required teachers and administrators alike to rethink their typical orientation to the data-gathering and data-analysis process. Ten tips for successful walk-throughs are presented.