70/20/10 Model (Learning and Development)
The 70:20:10 Model for Learning and Development (also written as 70-20-10 or 70/20/10) is a learning and development model that corresponds to a proportional breakdown of how people learn effectively; based on a survey asking nearly 200 executives to self-report how they believed they learned.
In this survey respondents reported the following learning tendencies:
- 70% from challenging assignments
- 20% from developmental relationships
- 10% from coursework and training
Lombardo and Eichinger expressed their rationale behind the 70:20:10 model this way in The Career Architect Development Planner:
“Development generally begins with a realization of current or future need and the motivation to do something about it. This might come from feedback, a mistake, watching other people’s reactions, failing or not being up to a task – in other words, from experience. The odds are that development will be about 70% from on-the-job experiences - working on tasks and problems; about 20% from feedback and working around good and bad examples of the need; and 10% from courses and reading.”
Criticisms of the hypothesis include:
- A lack of empirical supporting data 
- The use of perfectly even numbers 
- The nature of the survey (i.e. Asking already successful managers to reflect on their experiences.) 
- The model may not reflect the changes in the market instigated by online technologies. For example, it does not reflect the recent focus on informal learning.
- The 70:20:10 model is not prescriptive. Author and learning & development professional Andy Jefferson asserts it "is neither a scientific fact nor a recipe for how best to develop people." 
- Lombardo, Michael M; Eichinger, Robert W (1996). The Career Architect Development Planner (1st ed.). Minneapolis: Lominger. p. iv. ISBN 0-9655712-1-1.
- Kajewski, Kelly; Valerie, Madsen. "Demystifying 70:20:10" (PDF). Deakin Prime. Retrieved 20 May 2016.
- Thalheimer, Will. "People remember 10%, 20%...Oh Really?". Will At Work Learning. Retrieved 20 May 2016.
- Jefferson, Andrew; Roy, Pollock. "70:20:10: Where Is the Evidence?". Association for Talent Development. Retrieved 20 May 2016.
- "The 70:20:10 Model for Learning and Development | Training Industry". www.trainingindustry.com. 2017-09-28. Retrieved 2017-09-28.