A merger with another organization would likely require a revision to the information security program because it can result in significant changes to the structure, size, and information systems of the merged entity. This can affect the security requirements, risk tolerance, and governance policies of the organization. To ensure that the information security program remains effective, it is important to review and revise the security policies, standards, and procedures in light of the changes brought on by the merger. The information security program should align with the new organization's risk tolerance, security requirements, and governance policies. This information can be found in the ISACA's Certified Information Security Manager (CISM) Study Manual, Section 3.1.

The factor that has the greatest influence on the successful integration of information security within the business is organizational structure and culture because they determine how information security is organized, governed, and supported within the organization, and how information security roles and responsibilities are defined, assigned, and communicated across different levels and functions. Risk tolerance and organizational objectives are not very influential because they do not affect how information security is integrated within the business, but rather what information security aims to achieve or protect. The desired state of the organization is not very influential because it does not affect how information security is integrated within the business, but rather what the organization aspires to be or do. Information security personnel are not very influential because they do not affect how information security is integrated within the business, but rather who performs information security tasks or activities. Reference: https://www.isaca.org/resources/isaca-journal/issues/2016/volume-4/technical-security-standards-for-information-systems https://www.isaca.org/resources/isaca-journal/issues/2017/volume-2/how-to-align-security-initiatives-with-business-goals-and-objectives