This document discusses different types of observation methods used to study child development, including event sampling, rating scales, checklists, audio tapes, cameras, and video cameras. Event sampling focuses on specific predefined behaviors, while rating scales measure traits on a continuum. Checklists record the presence or absence of behaviors. Audio/video tapes and cameras can document discussions, projects, and play to provide insights into children's learning, thinking, and social skills. However, all methods have limitations and closed approaches may miss important behaviors.