Technical debt is a systemic problem - not a personal failing
From Technical Debt to Technical Health
Navigating Organizational Change
Domain Driven Design and Hexagonal Architecture with Rails
Agile 2012 Simple Design Applied
Releasing your teams energy through 'pull' conversations
Learning is Key to Agile Success: Agile Vancouver 2010
Agile learning agile 2010
Agile Learning (60 minute version)