Final answer:
Written approvals is not directed primarily at the control goal of input accuracy.
Step-by-step explanation:
The control plan that is not directed primarily at the control goal of input accuracy is written approvals.
Written approvals are part of the control plan that ensures the authorization and approval of transactions or processes. While written approvals contribute to process control and compliance, they are not directly focused on ensuring input accuracy. On the other hand, the other control plans mentioned in the options, such as document design, preformatted screens, and online prompting, are aimed at improving input accuracy by providing structured formats, validation checks, and real-time guidance to users.