Final answer:
The control plan that makes it easier to input data from a source document is known as document design, which integrates features that streamline data entry.
Step-by-step explanation:
The control plan you are referring to is document design. This involves creating source documents in such a way that they simplify the process of data input. Good document design can prevent errors by making it clearer where and what type of data should be entered, and can often include features such as checkboxes, barcodes, and predefined fields to ease the process of data collection and entry. This is different from written approvals, preformatted screens, and online prompting, which serve other functions in the data entry and control process.