Hi, I have just started to read the documentation, and it is not easy to make the distinction between a elements in the library and the others. Can I suggest to rename the namesapce alias? Instead of namespace logging = boost::log; namespace sinks = boost::log::sinks; namespace src = boost::log::sources; namespace fmt = boost::log::formatters; namespace flt = boost::log::filters; namespace attrs = boost::log::attributes; use namespace blog = boost::log; namespace blsinks = boost::log::sinks; namespace blsrc = boost::log::sources; namespace blfmt = boost::log::formatters; namespace blflt = boost::log::filters; namespace blattrs = boost::log::attributes; So every thing starting with bl is an element of the library. I have some innocent questions: * Is logging thread-safe? * If yes, are the lines interleaved as it is the case for output streams? * If not could you point out how and where in the implementation this is handled? Thanks, Vicente