Client logs are structured diaries kept by the client to record the unique qualitative contextual circumstances surrounding his or her targets, and to record quantitative dimensions of these targets....

Client logs are structured diaries kept by the client to record the unique qualitative contextual circumstances surrounding his or her targets, and to record quantitative dimensions of these targets. These logs can be set up to include preset (e.g., every hour) or open (e.g., critical incident) time categories, and can include any number of categories of information. Four types of logs—exploratory, target, interaction, and evaluation—can be used, and forms were provided for your use in practice. These logs can be used to pinpoint and define problems, generate individualized hypotheses for intervention, and monitor and evaluate change over time in a client’s targets. The practitioner log is a variation of the client log that can be used for much the same purposes, although it also can be used to monitor the delivery of services. Finally, we discussed strategies for maximizing and verifying the reliability and validity of client and practitioner logs.