"The Plain Language Action and Information Network (PLAIN) is a community of federal employees dedicated to the idea that citizens deserve clear communications from government. We first developed this document in the mid-90s. We continue to revise it every few years to provide updated advice on clear communication. We hope you find this document useful, and that it helps you improve your writing"
We have a multi-year process to re-license based on advice from multiple sources that Creative Commons is not applicable to data. We wish it were, and it probably will be in the future but it wasn't clear when we began. Until that happens we have a process to move to the Open Database License, which explicitly covers data and not just creative works like photographs or text. The ODbL was in fact started as a result of investigations around the needs of Science Commons and we just helped it to its conclusion.
At some point down the line I personally expect the ODbL and CC to be compatible and we will be able to cross-pollinate once more.