What is agile development?
How do you know if all this about Agile is not a scam? How do you know if all of it is about a whimsical fashion? Are there not enough cases of sophistry in History by which people have been fooled to put their resources in the hands of swindlers? (Sophistry is briefly discussed in this material from a community of philosophical inquire).
What makes work the ideas behind Agile?
As far as I am able to see, the answer contains something intimately linked to individuals, and not to the ideas themselves. It is about the way individuals think, and about how they learn to improve their thoughts.
What resides at the center of Agile, what is required to inquire into and adopt regardless of name and external ceremonies, is a learning style. A power or ability to put ourselves in a given mental position or attitude, by which we search to be aware of the terrain and give it priority over what the map might say. I think there are clear correlations of intellectual patterns between agile thinking and philosophical inquire.
As no one can think on behalf of other, the responsibility to develop such power or ability resides in the individual.