IBM Consultant interview questions

What is the most important quality for a good consultant?

One of the cases was about a company looking to increase profits without having to make a large capital investment. The company had a couple of different product lines with very different pricing. The idea was to think through the possible options the company might have, such as adjusting prices, devoting a larger number of facilities to the higher margin product, etc.. It was definitely important to ask relevant questions, as there were useful details that were disclosed if the information was asked for.