Five Sketches™

The Agile Manifesto includes twelve principles. These two are related:
Deliver working software frequently [in short sprints that last] from a couple of weeks to a couple of months, with a preference to the shorter timescale.
Working software is the primary measure of progress.
From discussions with other practitioners, I know that software teams can get dogmatic about the above […]

It takes a range of skills to develop a product. Each skill—embodied in the individuals who apply that skill—brings with it a different focus:

Product managers talk about features and market needs.
Business development  talk about revenue opportunities.
Developers talk about functionality.
Usability analysts talk about product- and user performance.
Interaction designers talk about the user experience.
QA talks about quality and defects.
Marketing talks about the messaging.
Technical communicators […]