This is a question that arises much passion, depending upon personal experience. In this context the question is whether to take a departmental or corporate approach (and we are not referring to the Kimball vs Inmon debate). Data marts tend to be departmental, and data warehouses corporate.
First the cynical view.
Most IT professionals tend to avoid departmental approaches where a corporate one can be employed. It fits our sense of standards and orderliness, and we’ve all seen the unsupportable and costly mess that ad hoc delivery can cause. We tend to associate departmentally driven solutions with more ad hoc focused delivery.
Business Intelligence should provide information to those business users smart enough and willing enough to modify and improve their behaviour. It is a true adage that without enthusiastic users a BI solution will invariably fail. So, if your organisation has the required BI zeal at a departmental but not at a corporate level, then ignore your instincts to push for a corporate solution. You will be benefiting someone so it will be worthwhile. Obviously, if you can get the required corporate support, then go for it.
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