We chose urgent help pages.
For each department or agency that we wanted to include in the Report Card, we:
1 Came up with a situation in which people would likely seek urgent help or information from the agency.
2 Googled a phrase they would likely use in such a situation.
3 Found the first entry in the search results from that agency, as long as it was the first government agency in the search results and as long as it was a page giving instructions for a public audience.