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Here in the UK, a large proportion of healthcare is delivered by healthcare professionals other than doctors. If I go to my GP (family doctor) with a minor ailment, I'm likely to be treated by a Nurse Practitioner, who may have a Master's degree in nursing or may have never attended college at all. If I have a minor surgery, the surgery might be performed by a Surgical Care Practitioner working under the supervision of a consultant surgeon.
Lambda School have conclusively shown that it doesn't take four years to make someone into an employable software developer. How many other job skills could be taught through a short bootcamp programme, intensive vocational training or on-the-job training?