Noting that middle level teachers interested in involving their students in curriculum planning and instruction need resource materials to draw on, this document presents such a resource unit developed by a group of eight veteran middle level teachers and designed to be used within an integrated curriculum framework. Part 1 introduces the unit, discusses its use within a standards-based curriculum, and describes how to use the resource unit. Part 2 presents a rationale for studying time and includes middle school students' questions about time. Part 3 describes activities related to five strands of time: (1) time, culture, and society; (2) tracing time, considering the influence of the past on the present and future; (3) time and language, focusing on how time concepts are represented in human language and literature; (4) time and the environment, examining how the physical environment changes over time; and (5) time and the individual, focusing on the impact of time on people. Part 4 delineates inquiry-based projects involving time. Part 5 provides guidelines in developing successful student evaluations, from rubrics to narrative assessments. Part 6 provides sample culminating events for selected activities. Appended are three rubrics: a general rubric to be used with writing activities and two assessment tools. (Contains 14 resources.) (KB)