Rework, by Jason Fried and David Heinemeier Hansson, is a business manifesto challenging traditional business thinking. The authors, who founded the software company 37signals, argue for a leaner, more agile, and human-centered approach to business. They advocate for embracing constraints, rejecting growth for growth's sake, focusing on core values, and prioritizing productivity over workaholism. Rework provides practical advice on building products, managing a team, and promoting your business, all while prioritizing simplicity, efficiency, and authenticity.