Final answer:
The therapeutic procedure step that includes obtaining client history is known as Data Collection, which is essential for understanding a patient's background and context to inform further assessment and treatment.
Step-by-step explanation:
The step of the therapeutic procedure that includes obtaining the client history is typically known as Data Collection. Client history is crucial as it helps in understanding the contextual factors that may influence the patient's current condition. This is akin to historical inquiry where background information is gathered to support the development of historical interpretations. In research, this would involve the initial stages of data collection where information about the research subject, such as their background and context, is compiled and analyzed to formulate a comprehensive understanding of the subject's personal history and current situation. This process is essential as it sets the stage for the next steps of assessment and treatment planning.