During the summer and autumn of 2001, Giga Information Group asked data warehousing people at financial service institutions, insurance companies, retailers, manufacturers, transportation companies, and organizations in the private sector and education to let Giga take a look at the weaknesses in data warehousing solutions that they had implemented. Giga also asked what they would do differently if they had the chance. The result is a revealing, sometimes painful and often humorous look at the uses and abuses of data warehousing in the real world.

It would be an exaggeration to say that in every instance Giga has an easy solution. However, in every instance, there is a lesson learned and a best practice that can be inferred. In every case, it is important for firms building or operating data warehouses to understand what can go wrong. This enables action to be taken to reduce the risk of surprises such as schedule slips, disappointed customers or budget overruns due to technology miscalculations. This, in turn, enables implementation of state-of- the-art data warehouses that support high-impact business applications in CRM, supply chain management and business intelligence.

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