When you’re trying to get people to switch from a competitor to your product, you need to understand barriers of entry, and you need to understand them a lot better than you think, or people won’t switch and you’ll be waiting tables.

My third and final installment on strategy: Strategy Letter III: Let Me Go Back!

About the author.

I'm Joel Spolsky, co-founder of Trello and Fog Creek Software, and CEO of Stack Overflow. More about me.