This page shows monthly statistics charts of the discussion lists:

• Information Architecture (SigIA)
• WWW Human Factors (ChiWeb)

The statistics cover the following areas:

• Messages	Number of messages posted in a month.
• Message Posters	Number of posters posted in a month.
• Common Posters	Percentage of a given month's posters who had ever posted in the other discussion list.
• First-Time Posters	Number of posters posted for the first time since joining a discussion list.

The monthly data points in each chart show individual measurements. But they are not conducive to visualizing the overall trend. Thus, all charts include trend lines to highlight the ebb and flow of each discussion list's major trend.

Messages: number of messages posted in a month.

Message Posters: number of posters posted in a month.

Common Posters: percentage of a given month's posters who had ever posted in the other discussion list.

First-Time Posters: number of posters posted for the first time since joining a discussion list.