# Foundation

The Foundation layer provides the conceptual underpinnings of the Disciplined Agile® (DA™) tool kit. The foundation layer is organized into six key topics.

**[Mindset](https://www.pmi.org/disciplined-agile/mindset)**

The DA mindset is captured in the form of principles, promises, guidelines, and philosophies.

**[People](https://www.pmi.org/disciplined-agile/people)**

This addresses roles, responsibilities, and teams.

**[Agile](https://www.pmi.org/disciplined-agile/agile)**

Agile is both a mindset and a skillset.

**[Lean](https://www.pmi.org/disciplined-agile/lean)**

Lean produces value for customers quickly.

**[Serial](https://www.pmi.org/disciplined-agile/serial)**

DA adopts great ideas from serial/traditional sources.

**[Way of Working (WoW)](https://www.pmi.org/disciplined-agile/wow)**

In DA teams choose their own, fit-for-purpose, WoW.