Do we have rules for story writing?

I came across this interesting article from Pixar - The 22 rules of storytelling, according to Pixar. 

It got me thinking - this applies to our Agile world of Software Development too! 

• Anyone writing story cards - do you have certain rules / criteria in mind? I think quite a few things from the Pixar article apply in our world too!
• For us Testers, do we think about the functionality in the story cards based on these rules? Or, simply put, do we think about the new functionality in the story card affects the end-product? Do we think about the big picture enough?