Hi Joaquin, Sorry for joining this discussion so late, but here are my comments: - What is your evaluation of the design? - What is your evaluation of the implementation? The code looks clean. One minor question: the index class template's equal_range method forwards to lower/upper_bound. Is it really the best you can achieve here or is it just a temporary shortcut? - What is your evaluation of the documentation? I read the "tutorial" part. I believe the documentation is excelent -- does a great job of explaining things, and provides excelent examples to just be copy-pasted into the code for one to get started. - What is your evaluation of the potential usefulness of the library? At least once in my previous experience I had to maintain multiple synchronized collections. This project would have greatly benefitted from a library like the indexed set. I also think that the "compatible predicate" feature, so unfortunately missing from the std::set, is very useful. We are currently using the library to provide a set-based implementation for our RTL tables. This is not posted yet, but we hope to post it soon. We plan to eventially make the Indexed set-based table implementation default for our tables. - Did you try to use the library? With what compiler? Did you have any problems? Yes, with VC7.1. I did not have any problems related to the Indexed set. - How much effort did you put into your evaluation? A glance? A quick reading? In-depth study? I read the "tutorial" part of the documentation. Then I wrote Indexed set-based RTL table implementation, and made it default for RTL tables. After this I (eventially) successfully compiled and ran RTL tests, which, by that time all internally utilized the indexed set. I had to solve a few issues that showed up, but turned out to be our own issues (thanks for helping us to discover them). - Are you knowledgeable about the problem domain? I use STL collections a lot but never attempted to implement any non-trivial collection (I don't know if this is qualifies as domain knowledge). - Do you think the library should be accepted as a Boost library? Yes, definitely. Arkadiy