Interruptions cost 23 minutes 15 seconds, right?
An intertesting dive into the history of the "common knowledge" relating to the impact of an interruption on someone (generally) working on code.
"The Agile Manifesto paints an alluring picture of workplace democracy. The problem is, it’s almost always implemented in workplaces devoted to the bottom line, not to workers’ well-being. Sometimes those priorities align; the manifesto makes a strong case that businesses’ products can be strengthened by worker autonomy. But they’re just as likely to conflict, as when a project manager is caught between a promise to a client and the developers’ own priorities."
Pretty good article that covers many of the concerns I have with "Agile".