Hi, I has been reconsidering the reporting facilities of proposed Boost.Stopwatches. I have started to make some examples that make use Boost.Format to make the reports. Default reporting stopclock<> sw; prints the duration 29308.350 µs You can make a boost::format and pass it to the stopclock. void f1(long j) { boost::format fmt("%1%[%2%] f1(%3%) - Elapsed time: %4%"); fmt % __FILE__ % __LINE__ % j; stopclock< > sw(fmt); // burn some time } ../example/scoped_stopwatch_example.cpp[42] f1(1000000) - Elapsed time: 29834.769 µs ../example/scoped_stopwatch_example.cpp[51] void f2(long int) - Elapsed time: 0.979 µs You can change the precision, the output stream, the units and the unit text using a specific formatter. For example typedef elapsed_formatter<milli > formatter; formatter fmt("Elapsed time: %1%", std::cerr); fmt.set_duration_style(text); fmt.set_precision(6); stopclock<high_resolution_clock, formatter> sw(fmt); could print Elapsed time: 87.829801 milliseconds This formatter could be shared between several stopclocks (thread unsafe however). Even if the reporting facilities will not be completly 'localizable', I think that this interface goes one step towards in this direction. Before continuing the adaptation of the whole library I would like to hear some comments from you. Do you think this is an acceptable interface? What are the parameters that do you want to manage? procession, unit, short/long units, ... Best, Vicente