We know everything from Snapchat clones to the latest infographic are falling under the umbrella term of design these days — heck, the President of RISD plans to join Silicon Valley heavyweight Kleiner Perkins in 2014. But the reality is that user-centric experience design (the kind we highlighted at Roadmap last month) can have a massive impact in specific and underserved environments like the developing world.

At the Ted Women 2013 conference on Thursday, four women shared their stories on how they’ve designed, engineered and created products that are having a significant effect on a population. Krista Donaldson, the CEO of D-Rev, a nonprofit development company, called her company “user obsessed,” showing off iterations of the company’s ReMotion knee, an $80 knee prosthetic that provides balance and mobility for customers that make under $4 per day. Many of its customers were previously using a wooden stick for support…