Below is a compilation of general resources for those who would like to learn more and dig deeper into Lean and Agile Software Development. These resources are meant to provide a high level introduction to Lean and Agile as paradigms, as well as to provide some non-technical information about specialized non-technical aspects, like practices and roles.
Principles of lean thinking 
by Mary Poppendieck
An overview of lean, its history, and the principles behind it.
Lean software development 
in C++ Magazine, Fall 2003
by Mary Poppendieck
A high-level introduction of “Lean Software Development”.
Extreme Programming Explained: Embrace Change, 2nd Ed 
Addison-Wesley, 2005
By Beck, K. and Cynthia Andres
A comprehensive look at Extreme Programming, a popular Agile methodology, and one that we use at Ternary.
The Machine That Changed the World: The Story of Lean Production ’ Toyota's Secret Weapon in the Global Car Wars That Is Now Revolutionizing World Industry 
Free Press, 2007
by James P. Womack, Daniel T. Jones, and Daniel Roos
Not specifically about software development, this book describes lean production and its managerial system at Toyota.
An introduction to lean software development 
in PNEHM! Newsletter, June 2004
by Mary Poppendieck, Interviewed by Gustaf Brandberg
A very short interview on “Lean Software Development”; a good high-level introduction.
Lean Software Development: An Agile Toolkit 
Addison-Wesley, 2003
by Mary Poppendieck and Tom Poppendieck
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Ternary Software is a proud member of the following organizations:
Agile Alliance
The Agile Alliance is driven by the values and principles of the Manifesto for Agile Software Development. More about the Agile Alliance on their website:
www.agilealliance.org
Scrum Alliance
The Scrum Alliance is a nonprofit organization committed to delivering articles, resources, courses, and events that will help Scrum users be successful. More about the Scrum Alliance on their website:
www.scrumalliance.org
Eastern Technology Council
The Eastern Technology Council serves leaders of more than 700 technology and life sciences companies by providing valuable contacts and capital, information and education, through a wide variety of events, publications, and innovative services. The Council provides a business culture that embraces start-ups and established companies by promoting, supporting, growing, funding, and rewarding entrepreneurial activities in the region in an effort to promote growth and successful businesses. More about the Eastern Technology Council on their website:
www.easterntechnologycouncil.org
“I've worked with some software development companies where I never knew the status of my projects, what the work would cost me, when it would be completed, and how well the software would actually work once it was eventually installed. That's never been the case with Ternary. They keep me and my staff informed, they stay within the bounds of the costs we've discussed, and they always deliver on their commitments in terms of operating, implemented functionality. I can't imagine using anyone other than Ternary.”
— Mark Bodnarczuk, Executive Director, Breckenridge Institute