Class 102: Ruby on IDE. Prerequisites: 1.) Ruby (ftp://ftp.ruby-lang.org/pub/ruby/1.9/ruby-1.9.3-p429.zip) 2.) IDE (It's not as such required, but it's make the ruby coding job easy and manageable) (http://www.jetbrains.com/ruby/download/index.html) Download as per your system requirement. IDE is for all Mac, Windows and Linux OS environments. Before downloading and installing IDE, please check your machine hardware specifications. Note: Don't worry, if you don't know, how to install and configure the above prerequisite. I will share each details with you in upcoming classes :)