A self-checking digit is the most effective accuracy control for entry of a valid numeric part number. This method involves adding an extra digit at the end of every number which is calculated from the other digits. This digit is then used to check the accuracy of the entered number1. While hash totals, online review of description, and comparison to historical order pattern can be used as accuracy controls, they are not as effective as a self-checking digit.

The greatest concern for an IS auditor when a post-implementation review was conducted by issuing a survey to users is that the survey questions did not address the scope of the business case. A post-implementation review is a process of evaluating the outcomes and benefits of a project after it has been completed and implemented. A post-implementation review can help to assess whether the project met its objectives, delivered its expected value, and satisfied its stakeholders1. A survey is a method of collecting feedback and opinions from users or other stakeholders about their experience and satisfaction with the project. Asurvey can help to measure the user acceptance, usability, and functionality of the project deliverables2. A business case is a document that justifies the need for a project based on its expected benefits, costs, risks, and alternatives. A business case defines the scope,objectives, and requirements of the project and provides a basis for its approval and initiation3. Therefore, an IS auditor should be concerned if the survey questions did not address the scope of the business case, as it may indicate that the post-implementation review was not comprehensive, relevant, or aligned with the project goals. The other options are less concerning or incorrect because:
* A. The survey results were not presented in detail to management is not a great concern for an IS auditor when a post-implementation review was conducted by issuing a survey to users, as it is more of a communication or reporting issue than an audit issue. While presenting the survey results in detail to management may help to inform them about the project performance and outcomes, it does not affect the validity or quality of the post-implementation review itself.
* C. The survey form template did not allow additional feedback to be provided is not a great concern for an IS auditor when a post-implementation review was conducted by issuing a survey to users, as it is more of a design or format issue than an audit issue. While allowing additional feedback to be provided may help to capture more insights or suggestions from users, it does not affect the validity or quality of the post-implementation review itself.
* D. The survey was issued to employees a month after implementation is not a great concern for an IS auditor when a post-implementation review was conducted by issuing a survey to users, as it is more of a timing or scheduling issue than an audit issue. While issuing the survey to employees sooner after implementation may help to collect more accurate and timely feedback from users, it does not affect the validity or quality of the post-implementation review itself. References: Post ImplementationReview - ISACA, Survey - ISACA, Business Case - ISACA