Introduction

Hello! CSE 12X is the term used for CSE 121, CSE 122, and CSE 123, which cumulatively comprise three-quarter introduction to programming courses offered at the University of Washington. This page contains information that is common to all three of those courses. If you are looking for the web page of a specific 12X course, follow a link below to access the current-quarter’s webpage for the course you’re searching for:

• CSE 121 Homepage
• CSE 122 Homepage
• CSE 123 Homepage

What’s new?

If you are already familiar how the CSE 12X courses have operated in the past, you should be aware that we are making changes to begin in the Autumn 2026 quarter. Please check the individual courses’ syllabi for specifics. You may also be interested in the Learning to Program, Not to Code vision statement.