Hello I'm studing Ruby and in a short Ruby in Rails for the web development. I've observed that each verion of Ruby can introduce modifications in the sintax and behaviour of Ruby. In the other hand I suppose the comunity develop libraries in the stable release of the moment. The question is: What about backward compatibilty? If I write a Ruby program using 1.8.5, in the future I'll be able to run in using the Ruby 2.0? What about the libraries developed under 1.8 Ruby? If I have to develop a professional Ruby program for a company, and one day I have to update the Ruby's engine, or the ruby's version just because of a security hole, it would be a bad surprise that nothing works... Someone can clarify all this questions please? I would like to program in Ruby, but not at any price... Thank you very much! Joan -- Posted via http://www.ruby-forum.com/.