From the abstract: "Momentary time sampling, partial-interval recording, and event coding are observational coding methods commonly used to examine the social and challenging behaviors of children at risk for or with developmental delays or disabilities. Yet there is limited research comparing the accuracy of and relationship between these three coding methods. By coding the low-frequency social behaviors of 100 preschool-aged children with autism spectrum disorder, the current study examines the associations among the three methodologies. Results indicated a strong relationship among all three coding methodologies. The findings provide information to researchers and practitioners considering the benefits and drawbacks of each coding methodology."