The most important consideration when planning the next audit after many findings is to follow up on the status of all recommendations, as this will ensure that the audit findings are addressed in a timely and effective manner, and that the root causes of the issues are resolved12. Following up on the status of all recommendations will also help to assess the progress and performance of the IT department, and to identify any new or emerging risks or challenges34.
References
1: What to consider when resolving internal audit findings3 2: A brief guide to follow up4 3: Guidance on auditing planning for Internal Audit2 4: Corrective Action Plan (CAP): How to Manage Audit Findings1

Change control is the process of managing and documenting changes to an information system or its components. Change control aims to ensure that changes are authorized, tested, approved, implemented, and reviewed in a controlled and consistent manner. Change control is an essential part of ensuring the security, reliability, and quality of an information system.
One of the key elements of change control is testing and approval from quality assurance (QA). QA is the function that verifies that the changes meet the requirements and specifications, comply with the standards and policies, and do not introduce any errors or vulnerabilities. QA testing and approval provide assurance that the changes are fit for purpose, function as expected, and do not compromise the security or performance of the system.
An organization that has recently moved to an agile model for deploying custom code to its in-house accounting software system should still follow change control procedures, including QA testing and approval.
Agile development methods emphasize flexibility, speed, and collaboration, but they do not eliminate the need for quality and security checks. In fact, agile methods can facilitate change control by enabling frequent and iterative testing and feedback throughout the development cycle.
However, if change control does not include testing and approval from QA, this poses a significant security concern for the organization. Without QA testing and approval, the changes may not be properly validated, verified, or evaluated before being deployed to production. This could result in introducing bugs, defects, or vulnerabilities that could affect the functionality, availability, integrity, or confidentiality of the accounting software system. For example, a change could cause data corruption, performance degradation, unauthorized access, or data leakage. These risks could have serious consequences for the organization's financial operations, compliance obligations, reputation, or legal liabilities.
Therefore, change control that does not include testing and approval from QA is the most significant security concern to address when reviewing the procedures in place for production code deployment in an agile model.
References:
* Change Control - ISACA
* Quality Assurance - ISACA
* Agile Development - ISACA
* 10 Agile Software Development Security Concerns You Need to Know

A firewall is a device or software that monitors and controls the incoming and outgoing network traffic based on predefined rules. A firewall can help protect an organization's network and information systems from unauthorized or malicious access, by filtering or blocking unwanted or harmful packets. The most important thing for an IS auditor to verify when evaluating an organization's firewall is that the logs are being collected in a separate protected host. Logs are records of events or activities that occur on a system or network, such as connections, requests, responses, errors, and alerts. Logs can provide valuable information for auditing, monitoring, troubleshooting, and investigating security incidents. However, logs can also be tampered with, deleted, or corrupted by attackers or insiders who want to hide their tracks or evidence of their actions.
Therefore, it is essential that logs are stored in a separate host that is isolated and secured from the network and the firewall itself, to prevent unauthorized access or modification of the logs. Automated alerts are being sent when a risk is detected is a good practice for enhancing the security and efficiency of a firewall, but it is not the most important thing for an IS auditor to verify, as alerts may not always be accurate, timely, or actionable. Insider attacks are being controlled is a desirable outcome for a firewall, but it is not the most important thing for an IS auditor to verify, as insider attacks may involve other factors or methods that bypass or compromise the firewall, such as social engineering, credential theft, or physical access. Access to configuration files is restricted is a critical control for ensuring the security and integrity of a firewall, but it is not the most important thing for an IS auditor to verify, as configuration files may not reflect the actual state or performance of the firewall.

The most important issue for an IS auditor to consider with regard to Voice-over IP (VoIP) communications is the homogeneity of the network, because it affects the quality, security, and reliability of the VoIP service. A homogeneous network is one that uses a single protocol or standard for VoIP communication, such as Session Initiation Protocol (SIP) or H.32312. A homogeneous network can reduce the complexity, latency, and interoperability issues that may arise from using different or incompatible protocols or devices for VoIP communication12. Continuity of service, identity management, and nonrepudiation are also important issues for VoIP communications, but not as important as the homogeneity of the network. References: 1: CISA Review Manual (Digital Version), Chapter 4, Section 4.4.3 2: CISA Online Review Course, Module 4, Lesson 4