Independence or partnership?

In the book Hitchhiking Through the Galaxy by D. Adams, a race of intelligent mice constructs a powerful computer in order to get the ultimate answer to: "the big question about life, the universe and everything else." Every area of human endeavor has this type of extremely difficult question. Personally, I think that for the IT area it is the question of choosing how to implement projects.
Is it worth building your IT systems with the help of your internal IT department, or should you use external partners? Łukasz Nienartowicz - Head of Business Intelligence at Britenet - answers this question in his latest article for Insurance Gazeta.
A link to the full text can be found below:
Independence or Partnership?