This document outlines the basic principles of LEGO® SERIOUS PLAY®, which uses LEGO bricks as a hands-on tool to unlock creativity and facilitate collaborative problem solving. It describes how LEGO® SERIOUS PLAY® originated from efforts within the LEGO company to promote innovation and participation. Key aspects of the methodology include building models to represent ideas, reflecting on the models individually and then discussing them as a group in order to gain new insights. Proper use of LEGO® SERIOUS PLAY® involves cycles of building, reflection, and dialogue over multiple hours to achieve meaningful results, rather than simply communicating messages or having a casual icebreaker activity.