Here is the introduction to my guest post on TechFlash today.

For the last decade, I have been convinced that the three most important factors in determining the success of a start-up are (1) team, (2) product or service, and (3) market (timing, size, etc.). Take an A+ entrepreneur, with a great idea for a new product or service, at the right time, and about as fast than you can tweet Susan Boyle you’d have a success brewing.

Recently, I have added one factor to the must-have list: the right start-up culture. In other words, add a dose of bad culture to a team of superstars, a killer product and good market opportunity, the result is almost always death by a thousand backstabs.

What defines a great start-up culture? Justice Stewart’s “I know it when I see it” standard seems particularly apt here, but not actionable. I am hoping to start a dialogue about what a great start-up culture is and what it isn’t from those of you who are actually living it day-to-day. To kick off the debate, below is my best attempt at defining the characteristics of a great start-up culture. I was aiming for a top 10 but ended up with a bakers’ dozen (because in life it’s hard to beat a free bagel). How does your company’s culture stack up?

To read the list click over to Techflash.