1. This is a timeline of the RDA interest and working groups launched from the beginning through November. At the bottom are the earliest groups, at the top the newest ones.
This chart shows only when a group was endorsed. Earlier version showing the duration of group’s lives wasn’t useful because IGs don’t have an ending date, and WGs all have the same duration. 
I don’t see a particular pattern of group formation evident from this timeline. 
Here, color-coding of the bars to differentiate IGs from WGs would have been nice, but I could not make that happen.
Desirable future visualizations: what IGs spawned what WGs.