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Three Horizons or pace layering?
Both are about different speeds. Three Horizons splits investment by how soon it pays back. Pace layering splits the architecture by how fast each part should change.
Three Horizons
Manage the core, the emerging and the future at the same time, with different goals, measures and funding for each.
Reach for it when
- Allocating budget and attention across a portfolio
- Shaping a roadmap that must fund today and tomorrow
Pace Layering
Layers of a system change at different speeds. Let fast layers move without disturbing slow ones.
Reach for it when
- Deciding which parts of the architecture must stay stable
- Designing the interfaces between fast and slow layers
Together
Horizon 3 experiments belong on fast layers that are cheap to change; core systems of record sit on the slow ones.