Well, from what I've seen some of the following are common patterns too (with almost any failure story):<p>- Thinking your idea is some million dollar unique concept that others are desperate to 'steal', and only talking to people if they sign an NDA.<p>- Not knowing the audience your projects/products/companies/services are for, and making someone no one actually wants or needs.<p>- Copying other companies without having any real way to differentiate your product. This can in theory work if you can do things for super cheap (I think Rocket Internet or someone like that in Germany does it), but most copycats tend to fail.<p>- Expecting others to do all the work while being the 'ideas guy'.<p>- Relying too much on people who you don't know, who don't live nearby, who aren't being paid and have no loyalty to you.<p>- Getting stuck in an endless cycle of feature/scope creep, and not putting out a MVP. This is probably my own biggest issue, for pretty much everything under the sun.<p>- Launching at the wrong time, especially if your market has moved on. Actually, these last two points kinda go hand in hand really, you spend so long working on an unproven idea with no hurry to get anything done that by the time it does get released your 'audience' has long since left and moved onto other things, and the rest of the world has left you behind in terms of tech, aesthetics, design, etc.