---
id: "prereq-70-20-10-framework"
type: "prereq"
source_timestamps: ["§ 2. Build a Distributed Apprenticeship Pipeline"]
tags: ["hr-theory", "pedagogy"]
related: ["claim-70-20-10-development-loss"]
reason: "Required to grasp why formal training modules cannot replace the developmental value of entry-level roles."
sources: ["reskilling"]
sourceVaultSlug: "hbr-seg-reskilling"
originDay: 10
articleStem: "hbr-sig-51-talent-strategy-ai-transformation"
sourceUrl: "https://hbr.org/2026/06/your-talent-strategy-has-to-keep-up-with-your-ai-transformation"
sourceTitle: "Your Talent Strategy Has to Keep Up with Your AI Transformation"
---
# Understanding of the 70-20-10 Development Framework

**Prerequisite knowledge.** The author assumes the reader understands the premise of the **[[entity-center-for-creative-leadership]]** 70–20–10 framework — that 70% of professional development comes from on-the-job experience, 20% from developmental relationships, and 10% from formal training.

**Why it's required:** without it, the reader cannot grasp why formal training modules (the surviving 10%) cannot replace the developmental value of entry-level roles — the entire arithmetic behind [[claim-70-20-10-development-loss]] and the [[concept-knowledge-cliff]]. Note the expert caveat carried in that claim: mid-career and lateral roles can also supply 70–20 learning, so the '90% destroyed' figure is a strong simplification.