Donay has done a great job of translating "O que leva uma pessoa a fazer isso?" Let me add to his post with an explanation of "What does is take for a person to do it?" It means "O que tem que fazer uma pessoa para fazer isso?" ou "Quais condiçôes devem existir para uma pessoa fazer isso?" Note how the meaning is different from Donay's answers. Look at the differences below.
What does it take to get a drink around here? (Very common among friends.)
How do I get a drink?
(The drinks are in the other room.)
What does it take to win your hand?
What must I do to become engaged to you?
What conditions must exist for me to marry you?
(You must have a job, prospects, and my father's permission.)
What does it take to be commander of an airbase?
What are the requirements for becoming an airbase commander?
If I wanted to be an airbase commander, what would I have to do first?
(You need to be a colonel or higher and have years of experience in the air force.)
What will it take to get your attention?
What must I do to get your attention?
What can I do that would make you notice me?
(Show me the money! Show me the money!)
What will it take to get your cooperation?
How large a bribe must I pay you for your help?
What must I do for you to help me?
(I am a poor civil servant with a large monthly car payment.)