The core idea is to maximize customer value while minimizing waste.
Lean means creating more of what customers want while minimizing cost of resources and time.
Lean is about creating value for customers.
What is value?
Value is a product or service to customers they evaluate is worth something to them.
So, the first goal of a lean organization is to create more value, of increasing worth.
The second goal is to ever minimize waste creating this value. Waste is any activity, resource, including capital, that does not directly add value for customers.
Lean for Services, not just for Manufacturing
Many consider lean only applicable to manufacturing (making widgets). This is not the whole story.
When the main activity of an organization is to provide services to customers, this organization may greatly benefit from Lean Thinking.
read move via Lean.org
Also, consider this free e-book :
Introduction to Scrum and Scrumban