IT workers are often lambasted for a lack of business understanding, but business people should better understand how IT works if the gap between them is to close.
This week sees the availabilityof a book that explains exactly what IT people do.
The book, which was first written in German in 2006, is now available in English.
As a software programmer who has worked his way up to CIO level, Roeltgen understands the gap between the IT department and the business.
"In IT we always tell business people that the things we do are very complicated so this is all they see. But they do not see the reasons why this is the case," he told Computer Weekly.
He said business people should understand IT better rather than just taking it for granted and expecting IT people to understand the business.
"We always talk about business alignment for IT staff, but we never talk about IT alignment for business staff."
The book contains chapters about projects and why they often fail. It also explains to business people why the IT department cannot just quickly download software like people can do on their personal computers.
Other chapters cover security, tasks and explain what IT job titles actually mean.