Final answer:
Written approvals, option b, is not primarily directed at the goal of input accuracy. It focuses on verification and authorization. The other options are designed to directly ensure data input accuracy.
Step-by-step explanation:
The control plan that is not directed primarily at the control goal of input accuracy among the options given is b. written approvals. Written approvals are generally used to ensure that a certain action or process has been reviewed and authorized by the appropriate party. It is more about verification and authorization rather than directly ensuring the accuracy of the data input. On the other hand, the other options, such as document design, preformatted screens, and online prompting, are all directly aimed at improving the accuracy of data entered into a system by making the data entry process more foolproof and guiding users to provide the correct information.