The clue is in the title. You would probably spend most of your time modelling businesses. In real terms, this means that you would probably have a good head for numbers and spend the majority of your time in front of a very big, complex Excel sheet or Access data model. The models are generally either used as part of a transaction or to test an assumption.Here is what a few of the big four have on their website:http://www.pwc.co.uk/eng/services/Business_modelling.htmlhttp://www.deloitte.com/dtt/section_node/0,1042,sid%253D3715,00.html