Getting a startup off the ground is just the beginning. Growing a business is the next step. In this Project Grow series, we talk to entrepreneurs at New York's Varick Street incubator as they meet the challenges.

Mark Hirsch of CreativeWorx knew that his big idea -- software that helps other companies streamline the creative process -- would require time and resources to fully build out. So instead he developed prototypes to accelerate the process and land clients. In this video interview, hear how he did it, plus tips from experts on using "minimum viable products" to test the market. 

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