This document discusses how focusing on employee happiness can benefit companies. It provides several "happiness recipes" that include having a clear purpose, social recognition, a sense of control, and seeing progress. Having a purpose means being part of something bigger than yourself. Social recognition involves feeling important and gaining recognition from others. Control relates to having autonomy over one's work. Seeing progress provides feedback and a sense of impact. The document also discusses how practices like extreme programming can incorporate these happiness elements through having a shared system metaphor and vision, pair programming, collective code ownership, and releasing software frequently in small batches.