How did we get here? Chapters

In the last post, "How did we get here? Membership", we looked at a graph showing CSI's membership curve. I'm using the same graph this time, with a second curve to show the number of chapters. As was the case last month, it was hard to find accurate information, but the overall curve is close to what it would be if I did have all of the correct dates. For sources, I used charter dates that were given to the Bylaws Amendment Review Task Team, responses to an inquiry I sent to all chapters, Walter Damuck's history of the Institute, and 50th anniversary notices that appeared in various CSI publications. Along the way, eleven chapters were lost, a few by merger, and others because they fell below the minimum number of members required to keep their charters.