View 1 architectural styles 2 design patterns 3 openclosed principle 4 observer pattern 5 software development 6 liskovs substitution 7 singleton pattern 8 visitor pattern text PowerPoint (PPT) presentations online in SlideServe. SlideServe has a very huge collection of 1 architectural styles 2 design patterns 3 openclosed principle 4 observer pattern 5 software development 6 liskovs substitution 7 singleton pattern 8 visitor pattern text PowerPoint presentations. You can view or download 1 architectural styles 2 design patterns 3 openclosed principle 4 observer pattern 5 software development 6 liskovs substitution 7 singleton pattern 8 visitor pattern text presentations for your school assignment or business presentation. Browse for the presentations on every topic that you want.