DQI: MEMO
DATA QUALITY & INTEGRATION, A DIVISION OF DATABASE GROUP
To: Tom Anderson
From: Andrew Ness, Martha Swift
Date: 30-April-2001
Re: Unique Identifiers, a Ratings point of view.

The Credit worthiness of a debt is not dependant on downstream attributes such as market, clearing system or type of registration. Events that change the creditworthiness of a debt instrument, such as addition of a monoline insurance policy, can potentially have an impact on the identifier. From a Rating standpoint there is a need to distinguish, for example, the difference between the insured vs. non-insured portion of a debt that is partially insured on the secondary market.

Therefore: Data that uniquely identifies a security are: