The failure to execute a required script is a procedural control weakness. The most direct and effective recommendation is to implement a control that ensures all steps in a critical process are completed. A closing checklist serves as a directive and detective control, providing a formal, verifiable record that all necessary tasks, including running specific scripts, have been performed. This directly addresses the risk of human error or omission in a multi-step, critical process like a year-end financial close, preventing recurrence of the identified issue.

A. Retraining assumes the failure was due to a lack of knowledge, not a simple oversight, which is a less likely root cause for a missed step.
C. Updating the operations manual is a passive control; it does not actively ensure that the documented procedures are followed during the execution of the process.
D. Adding staff with financial experience does not address the core operational failure of missing a technical step and is an inefficient solution to a process control problem. ---

1. ISACA, CISA Review Manual, 27th Edition. Domain 3: Information Systems Operations and Business Resilience, Section 3.4.3, "IT Operations." This section emphasizes the need for documented and standardized operational procedures to ensure consistency and prevent errors. A checklist is a primary tool for implementing and enforcing such standardized procedures for critical tasks.

2. ISACA, COBIT 2019 Framework: Governance and Management Objectives. Management Objective DSS01: Managed Operations. This objective focuses on delivering IT operational services as planned. Practice DSS01.05, "Manage operational problems," and the overall goal of consistent procedure execution support the implementation of controls like checklists to minimize operational errors and ensure completeness.

3. Weber, R. (1999). Information Systems Control and Audit. Prentice Hall. Chapter 15, "Auditing Computer Operations," discusses controls over data processing. The use of job schedules, run sheets, and checklists is identified as a fundamental control to ensure that all jobs are run, in the correct sequence, and that their completion is verified (p. 562-564).