Items in chapter 2018 Self-Study in June 2018 Jun 1 2017 Self-Study in May 2017 May 1 2015 Self-Study in December 2015 Dec 2 2015 Recognizing dependencies Aug 8 2015 Practical Object-Oriented Design in Ruby: Chapter 4 Jul 26 2015 Practical Object-Oriented Design in Ruby: Chapter 2 Jul 12 2015 Practical Object-Oriented Design in Ruby: Chapter 1 Jun 29