Core Idea

Growth-plate areas in engineering organisations are the teams growing fastest and handling the most critical scaling challenges — and simultaneously the most structurally fragile. Standard management breaks down there, requiring explicit recognition and different norms.

Growth Plates

In child development, growth plates are cartilaginous zones at bone ends that are most active during growth and simultaneously most structurally vulnerable. Vulnerability is intrinsic to the function: rapid growth temporarily sacrifices structural integrity.

Will Larson applies this metaphor to engineering organisations. During rapid company growth, certain teams become growth plates — growing fastest, handling the most critical scaling challenges, and simultaneously most fragile.

Characteristics of Growth-Plate Areas

• Headcount growing faster than the organisation can effectively onboard
• Manager-to-engineer ratios exceed the healthy range rapidly
• Normal management cadences (1:1s, sprint planning, roadmapping) are too slow or too heavy
• Documentation, process, and culture cannot keep pace with headcount growth
• The manager becomes a bottleneck — decision-making can’t centralise fast enough, but decentralisation hasn’t been established

Why Standard Management Breaks Down

• New hires overwhelm existing cultural norms before absorbing them
• Problems often have unknown solutions — unlike stable environments where playbooks exist
• Technical debt accumulates faster than it can be addressed
• The dominant management currency shifts from ideas and strategy to execution at pace

Larson’s Guidance for Growth Plates

1. Recognise the state explicitly — treat it differently from normal operational mode
2. Hire a dedicated leader with explicit authority and resources for the area
3. Accept temporary dysfunction as the cost of growth; don’t enforce stable-environment standards
4. Set a time horizon — “We accept this chaos for six months, then we stabilise” — and prepare for the transition out

The Transition Risk

Growth-plate teams build habits that work at high-growth speed: informality, speed over process, improvisation over playbook. When growth slows, those habits become dysfunctional. Teams that stabilise must actively unlearn the growth-plate mode — this requires explicit management, not the assumption that stability will self-organise.

Related Concepts

• Four-States-of-a-Team — growth-plate conditions map to teams in the “falling behind” or “treading water” state
• Organizational-Debt — growth plates are a primary generator of organisational debt
• Peanut-Buttering-Anti-Pattern — the opposite failure: spreading effort too thin
• Reorg-Navigation-Principles — the transition out of growth-plate mode often triggers reorganisation
• Larson-2019-An-Elegant-Puzzle

Sources

• Larson, Will (2018). “Managing in the growth plates.” Irrational Exuberance (personal blog). Published March 21, 2018. Available: https://lethain.com/managing-growth-plates/

• Larson, Will (2019). An Elegant Puzzle: Systems of Engineering Management. Stripe Press. ISBN: 978-1-732-26518-9. Available: https://press.stripe.com/an-elegant-puzzle

  • Chapter 2.2: “Managing in the growth plates”

• Mirtz, Timothy A., et al. (2011). “The Effects of Physical Activity on the Epiphyseal Growth Plates.” Journal of Clinical Medicine Research, Vol. 3, No. 2, pp. 51–56. PMC3194019. Available: https://pmc.ncbi.nlm.nih.gov/articles/PMC3194019/

• Hoffman, Reid and Yeh, Chris (2016). “Blitzscaling.” Harvard Business Review, April 2016. Article ID: R1604B. Available: https://hbr.org/2016/04/blitzscaling

  • Parallel framework: hypergrowth requires prioritising speed over efficiency

• Dunbar, Robin I.M., et al. (2021). “‘Dunbar’s number’ deconstructed.” Biology Letters, Vol. 17, No. 5. DOI: 10.1098/rsbl.2021.0158. Available: https://royalsocietypublishing.org/doi/10.1098/rsbl.2021.0158

Note

This content was drafted with assistance from AI tools for research, organization, and initial content generation. All final content has been reviewed, fact-checked, and edited by the author to ensure accuracy and alignment with the author’s intentions and perspective.