Hi Robert, After a few tweaks - which I will report later - I got serialization to compile on my installation of MacOS X. Before submitting my review I'm looking trough the documentation to see how I can implement an optimized archive along the lines of demo_fast_binary_archive.cpp, but extended to also support std::vector, std::valarray, ... At this point I have a question that does not seem to be addressed in the documentation: What is the difference betweem save and save_override or load and load_override? demo_fast_binary_archive.cpp uses save_override and load_override but I could not find it documented? It seems to me that the new serialization library allows me to do what I want but I'm confused regarding these functions. Best regards Matthias