Table 4: Sources of Data

Data Source	Advantages	Disadvantages
Client Chart	Best source of unreimbursable service delivery	Resource intensive Not available without written permission
Billing Information, paid claims	Availability Efficient in large studies	No bills for unreimbursed services Can be difficult to obtain Requires advanced programming and data management skills
Client self report or reports of others	Availability Identifies services not recorded	Resource intensive Inaccuracy due to selective retention and recall

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