The 70/20/10 learning and development model proposes an effective learning mix: 70% from on-the-job experiences (Speak to games with verbs), 20% from feedback and observing others (Zettelkasten method of note taking), and 10% from formal education (Schools are a newfangled notion).

This formula is derived from a survey where executives reflected on their learning experiences. It highlights experiential learning as the most impactful, supplemented by social learning and formal instruction.

However, it's worth noting the model is built on self-reported data, lacks empirical evidence, and faces criticism for its oversimplified numeric breakdown and potential obsolescence in a digital age. See Criticisms of the 70-20-10 Model for more here.

https://en.wikipedia.org/wiki/70/20/10_Model_(Learning_and_Development)

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