Is your DW/BI team able to easily respond to changing requirements? Are your stakeholders ecstatic with what is delivered by your DW/BI team? Is your DW/BI team able to deliver new changes quickly into production? If the answer to any of these questions is no, then you likely want to consider adopting a disciplined agile approach to DW/BI development.
A disciplined agile DW/BI team will invest some time with initial requirements modeling, architecture modeling, and planning. But this will take a few days or maybe a week or two, certainly not months. They following a usage driven approach they will develop vertical slices of functionality. These slices fully tested and could potentially be deployed into production at any point in time. They work in an evolutionary and highly collaborative manner, resulting in quicker time to deliver, higher quality, and greater stakeholder satisfaction. This isn’t your grandfather’s traditional DW/BI approach.