In case you are having issues watching this video, please follow these simple steps to help us investigate the issue:
1. Right click on the video player and select Copy log
2. Paste the copied information in an email to video-issue@infoq.com (clicking this link will fill in the default details in most email clients).
Note: in case your email client hasn't automatically picked up the email subject, please include in your email the URL of the video too.
3. Done.
We will investigate the issue and get back to you as soon as possible. Thanks for helping us improve our site!

Summary
Ralph Johnson discusses principles, practices and tools relating to software development starting not from scratch but from already existing code which needs refactoring, maintenance, and sometimes architectural change.

Bio
Ralph Johnson is one of the four authors of the Design Patterns book. He is currently involved with the CS Department at the University of Illinois and the leader of UIUC Patterns/Software Architecture Group. He is mostly interested in OOP, especially frameworks, patterns, business objects, and Smalltalk, and researches refactoring, being involved in creating the Smalltalk Refactoring Browser.

About the conference
QCon is a conference that is organized by the community, for the community.The result is a high quality conference experience where a tremendous amount of attention and investment has gone into having the best content on the most important topics presented by the leaders in our community.QCon is designed with the technical depth and enterprise focus of interest to technical team leads, architects, and project managers.