Final answer:
The document summarizing manufacturing activities in a process department is known as the production report, which is key for monitoring production activities and manufacturing efficiency.
Step-by-step explanation:
A document that summarizes the manufacturing activity that takes place in a process department for a given period of time is called the production report. This report includes details such as operations completed, the quantity produced, the cost involved in production, and information on the flow of materials through the manufacturing process. It is essential for tracking production activities, assessing manufacturing efficiency, and for decision-making regarding maintenance, process improvements, and cost control.