Reproduced/adapted from A Big Spaceship book
© 2013 Big Spaceship, LLC.
And they said it better when it comes to copyright and sharing:
Some rights are reserved. Some reservations are right. Feel free to reproduce or transmit this document in any form or by any means, electronic or mechanical, including photocopying, recording, or by an information storage and retrieval system. Just don’t try to sell it. Information is meant to be free.