Source constraints

Source constraints could arise simply because of the way some systems are designed. A system designed to store data at a customer level will not be able to efficiently store data that has been aggregated at an account level, for example. Vendor changes may impact data quality or the frequency of when data is available. Organizations also have differing archival policies, so if a modeler is looking to use time series data that goes as far back as a decade, some of this data may have already been archived and retrieval may be a time-consuming affair.