• The difference between just-in-case and just-in-time is like the difference between training and trying.
  • Person A never learned Algebra and never uses it. Person B learned Algebra in grade school and uses it daily.
    • It would be hard to learn Algebra just in time. And the likelihood that Person B would use Algebra, if they had not learned it, is slim-to-nil

What is the perfect balance of Just-In-Time learning vs Just-In-Case? Is a difficult question to answer.

One cannot simply learn something Just-In-Time if they do not know a solution or problem exists.

Source: https://www.johndcook.com/blog/2010/03/03/just-in-case-versus-just-in-time/