This document discusses the history of timekeeping and scheduling. It explains that in the 1700s, each train station had its own clock and times were not standardized until 1884 when time zones were established. The document also discusses the importance of scheduling, using the example of building a house where foundations must be poured before walls are raised and walls raised before the roof is installed. Finally, it outlines some scheduling techniques such as using diagrams and notes that complex scheduling is primarily the job of a project manager.