Using a data set derived from herbarium specimens collected in California from 1906-2009, you’ll be guided step-by-step through the processes of organizing, summarizing, visualizing, and analyzing the data using Microsoft Excel. An introduction in the guide provides background on herbaria, the motivations behind the research project, and the structure of the data set. Discussion questions and suggestions for continued learning are included for each section.  Created by Susan Mazer, Alisa Hove, and Brian Haggerty at the University of California, Santa Barbara as part of the Phenological Literacy: Understanding Through Science and Stewardship Program (PLUSS).