All of the above practices and processes are based on the principles and values of Lean Thinking, Empiricism and Metrics, and The Agile Manifesto.

Empirical Data/Metrics

Without empirical data and metrics, decisions will be made with incomplete or erroneous information. "Empiricism 1 asserts that knowledge comes from experience and making decisions based on what is observed."

Lean Thinking

Based on Lean Thinking in manufacturing, we can eliminate waste by mapping our processes and identifying areas of improvement. "The Lean-Agile Mindset 1 is the combination of beliefs, assumptions, attitudes, and actions of SAFe leaders and practitioners who embrace the concepts of the Agile Manifesto and Lean thinking. It’s the personal, intellectual, and leadership foundation for adopting and applying SAFe principles and practices." "Lean thinking 2 reduces waste and focuses on the essentials."

The Manifesto for Agile Software Development

We are uncovering better ways of developing
software by doing it and helping others do it.
Through this work we have come to value:

Individuals and interactions over processes and tools
Working software over comprehensive documentation
Customer collaboration over contract negotiation
Responding to change over following a plan

That is, while there is value in the items on
the right, we value the items on the left more.

Principles behind the Agile Manifesto

We follow these principles:

Our highest priority is to satisfy the customer
through early and continuous delivery
of valuable software.

Welcome changing requirements, even late in
development. Agile processes harness change for
the customer's competitive advantage.

Deliver working software frequently, from a
couple of weeks to a couple of months, with a
preference to the shorter timescale.

Business people and developers must work
together daily throughout the project.

Build projects around motivated individuals.
Give them the environment and support they need,
and trust them to get the job done.

The most efficient and effective method of
conveying information to and within a development
team is face-to-face conversation.

Working software is the primary measure of progress.

Agile processes promote sustainable development.
The sponsors, developers, and users should be able
to maintain a constant pace indefinitely.

Continuous attention to technical excellence
and good design enhances agility.

Simplicity--the art of maximizing the amount
of work not done--is essential.

The best architectures, requirements, and designs
emerge from self-organizing teams.

At regular intervals, the team reflects on how
to become more effective, then tunes and adjusts
its behavior accordingly.