Hi, I don''t have a specific ROR question but since clear design is on of ROR''s main principles i''m hoping that some design folks can answer my question :). I''m working on a webbased application which uses a lot of classic javascript. There are several screens with a lot of controls and the problem is that a modification to one controls (for example a dropdownlist) has influence on several other controls, which in turn can influence other controls. For example I change dropdown A, this should load other values in dropdown B and C, because there are now other values in dropdown B and C, textbox D and E should be disabled, and checkbox F should be hidden. I have several of these scenario''s in the screens I''m working on and the code is slowly turning into "Big Ball of Mud" code. Does anyone know if there are patterns/principles/books to solve this problem in a structured way so that I can prevent my code from becoming a unmaintainable mess? -- Posted via http://www.ruby-forum.com/.