I've started to look at the signals/slots libraries for a task I have to do and have found it interesting. I'm curious about the header placement of headers and namespaces used by this library. Specifically I find the following. boost/signal.hpp containing boost::signal boost/visit_each.hpp containing boost::visit_each boost/last_value.hpp containnig boost::last_value as these are part of the signals library, should they be in boost/signals/... with namespaces of boost/signal/signal ... etc.? This is especially confusing in the case of signal.hpp which is not at all were one would expect to find it. Are these things where they are due to some oversight? Or were they placed there for some special reason. Were their separate reviews of these things. They seem to be part of the signals/slots libraries. Robert Ramey