Can not explain ACL behavior

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http://unix.stackexchange.com – So this is situation: got server for web-developers. There are many developers. All developers + PHP + Apache belongs to www group. There is a development directory - development. The goal is that every file in development directory has 755 permissions and whenever a any developer creates, modifies a file in development directory, files will still have 755. So I have read a number of acl tutorials, guides and howto's but I still can not get the result I want. my disk is mounted with acl I got chown -R www:www development added chmod g+s development I set a number of acl rules on developmen (HowTos)