Hi, According to: http://www.digitalmars.com/pnews/read.php?server=news.digitalmars.com&group=digitalmars.D&artnum=135947
And also source code within dmd2/src It seems that there is only one file per module. Is module similar to a single java package and namespace in VC++/C#? If yes, most name spaced programming language allow breaking of single module into multiple file to store various logically linked class and separate them when they are not. Like module Collection may have: Common interfaces for both HashMap, LinkedList and hashlist. But they should be all be in different source file(HashMap.d, LinkedList.d, HashList.d) but logically within the same module collection.(Directory) How do I do that within D? what is the directory layout of the project? Matthew Ong