The “Five Moments of Need” is the well known model introduced by Bob Mosher & Conrad Gottfredson in their 2011 book,  Innovative Performance Support.  The model captures both formal and informal learning paths and needs.

The Five Moments of Need address the requirement to select the right tools at the right time of need to facilitate learning, with the end goal being that a worker can accomplish a task as the result:

This great info graphic illustrates how a blended learning approach can address the five moments of need:

Blended Learning to Address the Five Moments of Need Infographic
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References: C. Gottfredson and B. Mosher, Innovative Performance Support (McGraw Hill, 2011)