Window Types

We offer two types of data window--Rolling and Static.

A Rolling window is expressed relative to the delivery date and shifts forward with the passage of time. For example, a customer who gets a 5 year Rolling window and who receives a delivery on May 4, 2004 would be sent data covering the period from May 4, 2004 to May 4, 2009. If this customer receives another delivery on May 18, 2004, the data would cover the period from May 18, 2004 to May 18, 2009.

A Static window, on the other hand, always covers the period from January 1 of one year to December 31 of another. The Static window rolls forward once a year in late January or early February. A customer who gets a 5 year Static window would receive data for the period January 1, 2004 to December 31, 2008 for deliveries made on both May 4 and May 18, 2004.

When choosing between the two types of window, you may wish to keep in mind the following:

• Due to constraints imposed by our systems, all windows under 2 years must be Rolling.
• Rolling windows entail a bigger data flow. This is because, in order to ensure that you have the same end date for every financial center, all deliveries must consist of a full set of fresh data for every financial center that you license. By contrast, when issuing an update to Static window customers, we normally deliver data only for the affected centers.
• Tracking the deltas (changes) is much easier with a Static window.