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Look books are the traditional, non-digital, paper catalogs that fashion designers use to show off their designs to magazine writers and editors. Fed up with the cumbersome process of having to look through every page to find the right item, Meggan Crum envisioned a website where she could just click on the items she needed via an online shopping-style web site, and have them delivered to her. She ran the idea by her colleague and good friend, Mandy Tang, who was getting her MBA at Columbia. The two then decided to found The Runthrough, a site that is shaking up the editorial side of the fashion industry.

Check out our interview with Mandy and Meggan to learn how they launched using Lean Startup principles, the challenges of running a company with two co-founders and how they go their business off the ground.

You can also view the video on Mashable.