Though certificates look good on a resume, that makes them tomorrow's solution to yesterday's problem.
But I interviewed knowledge workers from a variety of fields (e.g. a variety of engineering fields, management consulting) about hiring for a project I was considering. I was surprised how small a role resumes/credentials played in most hires.
A lot of job contacts are made by word-of-mouth, hiring decisions were largely based the candidate's ability to talk intelligently about their previous projects, and HR asked for a resume after the deal was almost done.
I'm sure there are situations where traditional resumes are still very important. But it appears less common than I'd assumed.
If I read a pile of books on international development and the economics of foreign aid, participate in local group discussions, go to lectures, and contribute to online communities, how do I communicate that base level of knowledge to an employer?
If I could enroll in an EdX international development program that consists of a series of classes and projects and results in me receiving an EdX International Development Certificate then I have a short one line item that I can stick on a resume if I want to apply to work with a business in that realm.