Working on another Design Thinking project I just came across this condensed version of an original HBR blog post by Warren Berger (http://blogs.hbr.org/cs/2010/07/the_four_phases_of_design_thin.html) that sums up the four important steps:
Question. Don’t just ask the obvious questions. Look deeper and don’t be afraid to rethink basic fundamentals about your business and products.
Care. Caring doesn’t just mean giving great customer service. Get to know your customers as intimately as possible. Immerse yourself in the lives of the people you are trying to serve.
Connect. Find ways to bring together concepts, people, and products. Many great breakthroughs are “mash-ups” of existing ideas.
Commit. Give form to your idea as quickly as possible: create a prototype and begin testing it right away. This is the only way to know if you’ve touched on something truly promising.