Lean project management allows you to regularly deliver business value without being based on lists of requirements, features, and functions.
The book The Machine That Changed the World was based on the Massachusetts Institute of Technology's $5 million 5-year study on the automotive industry, making the term lean production world famous.
This book proposed the following principles of lean:
Identify customers and specify values
Identify and map the value stream
Create flow by eliminating waste
Respond to customer pull
Persue perfection
From this, there are the following Lean Principles when it comes to software development, which are largely based on the manufacturing principles of lean production:
Eliminate waste
Amplify learning
Decide as late as possible
Deliver as fast as possible
Empower the team
Build integrity in
See the whole
Good architecture through reusable components, automated deployments, and good architecture can all assist in attaining this goal.