The team I’m working with at the moment is at a formative stage and has come up with a set of principles to collectvely aspire to:

Ship Something
Our overriding goal is to add value to the business as quickly and effectively as possible

Done
Our definition of done is when it is live and has been thoroughly tested

No hidden work
All work items should be tracked on the board

Unit Tests
All new or changed code should be thoroughly unit tested

Boy Scout rule
Leave everything in a better condition than you find it

Take risks
We are prepared to take risks with new technology and ideas

Be a tester
It’s everyone’s responsibility to make sure all work is thoroughly tested before being released