"Individuals and interactions over processes and tools "
"Build projects around motivated individuals. Give them the environment and support they need, and trust them to get the job done."
"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."
People often forget some of these things quite easily. What people remember is "frequent delivery of software", "deliver working software" etc.. This is common among new managers trying to understand Agile , because what is popular about Agile in the market is iterative development, and rapid delivery of software. Sadly people forget that its the team which ultimately delivers the software, and for an Agile team, the things quoted above are indispensable.