Hello, I used John's logging library for a project at work and it worked well. Note that this review is for the previous version, not the one currently on the website, which I haven't tried yet. * What is your analysis of the design? Before trying this library I tried some other C++ logging libraries, including all the Log4J clones. For various reasons I rejected all of those - some of them wouldn't even compile, and their documentation was lacking. I also had my own logging code but it was in a more C style of programming and I wanted something that was in C++. Compared to the Log4J clones, I found John's library to be easy to understand. There are two shortcomings that I found: - Whenever you restart your program it wipes out the previous log file. I could have coded around this, but it wasn't a big deal to me. It would be nice to have it automatically rename or append to the old log file instead of just replacing it, IMO. - No log rotation. This library does not support log rotation (at least in the version I tried). I didn't need this feature for my project, but I'm sure it will be a frequently requested feature. * What is your evaluation of the documentation? Great. * What is your evaluation of the potential usefulness of the library. Nearly essential. Just about every program I've written uses some kind of logging. * Did you try to use the library? With what compiler? Did you have any problems? VS.NET '03 on Win2k, which didn't have any problems. * How much effort did you put into your evaluation? I used it in the program I was working on, which was multithreaded, with each thread printing log messages. I was able to run it on even the slowest computers without any problem. * Are you knowledgeable about the problem domain? I'm no expert. I just wanted to use a logging library which used streams instead of printf-style formatting and worked with multiple threads. This library has fewer features than others, but it gets the job done. * Do you think the library should be accepted as a Boost library? Yes, but I suggest the author adds log rotation, because it is a feature lots of people need. -Matt