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Nonrepudiation provides an assurance that the sender of data is provided with proof of delivery and the recipient is provided with proof of the sender's identity, so neither can later deny having processed the data. Further, this concept can apply to any activity, not just the sending and receiving of data; in a more general sense, it is a mechanism to prove that an activity was performed and by whom. Nonrepudiation is typically comprised of authentication, auditing/logging, and cryptography services.

https://www.sciencedirect.com/topics/computer-science/nonrepudiation

Emergency changes. These are changes that must be implemented as soon as possible; for example, to resolve an incident or implement a security patch. Emergency changes are not typically included in a change schedule, and the process for assessment and authorization is expedited to ensure they can be implemented quickly. As far as possible, emergency changes should be subject to the same testing, assessment, and authorization as normal changes, but it may be acceptable to defer some documentation until after the change has been implemented, and sometimes it will be necessary to implement the change with less testing due to time constraints. There may also be a separate change authority for emergency changes, typically including a small number of senior managers who understand the business risks involved.”

https://itsm.tools/why-what-change-management/#:~:text=Emergency%20changes. &text=Emergency%20changes%20are%20not%20typically,they%20can%20be%20implemented%20quickly.

https://www.bmc.com/blogs/itil-service-request-management/

“Service desk staff require training and competency across a number of broad technical and business areas. In particular, they need to demonstrate excellent customer service skills such as empathy, incident analysis and prioritization, effective communication, and emotional intelligence.

https://www.servicedeskinstitute.com/the-case-for-itil4-foundation-service-desk-analyst-training/#:~:text=%E2%80%9CService%20desk%20staff%20require%20training,effective%20communication%2C%20and%20emotional%20intelligence .

The first important step is identifying and managing all the stakeholder groups that an organization deals with. The first and most obvious stakeholder group is the customers, as in service management the organization’s main goal is to facilitate customer outcomes. Other examples of stakeholder collaboration include:

Developers working with other internal teams

Suppliers collaborating with the organization

Relationship managers collaborating with service consumers

Customers collaborating with each other

Internal and external suppliers collaborating with each other

The contribution to improvement of each stakeholder group at each level should be understood, as should the most effective methods to engage with them. Depending on the service and the relationship between the service provider and the service consumer, the expectations about the level and type of collaboration can vary significantly. It is important to involve stakeholders, and address their needs at all levels. Determining the type, method, and frequency of such messaging is one of the central activities related to communication.

https://www.bmc.com/blogs/itil-guiding-principles/

The purpose of the service request management practice is to support the agreed quality of a service by handling all pre-defined, user-initiated service requests in an effective and user-friendly manner. Service request management is dependent upon well-designed processes and procedures, which are operationalized through tracking and automation tools to maximize the efficiency of the practice. To be handled optimally, service request management should follow these guidelines:

Service requests and their fulfilment should be standardized and automated to the greatest degree possible.

Policies should define which service requests will be fulfilled with limited or even no additional approvals so that fulfilment can be streamlined.

The expectations of users regarding fulfilment times and costs should be clearly set, based on what the organization can realistically deliver.

Opportunities for improvement should be identified and implemented to produce faster fulfilment times and take advantage of automation.

https://www.bmc.com/blogs/itil-service-request-management/

Effective incident management often requires a high level of collaboration within and between teams as this can facilitate information-sharing and learning, as well as helping to solve the incident more efficiently and effectively. There may also be a need for good collaboration tools so that people working on an incident can work together effectively. One technique that takes advantage of collaboration is termed swarming. This brings many different stakeholders together to work on the issue. Management of incidents may require frequent interaction with third party suppliers, and routine management of this aspect of supplier contracts is often part of the incident management practice.

https://www.bmc.com/blogs/itil-incident-management/

The purpose of the SLM practice is to set clear business-based targets for service performance, so that the delivery of a service can be properly assessed, monitored, and managed against these targets. SLM involves service level activities, including:

Defining service levels

Documenting

Actively managing them

https://www.bmc.com/blogs/itil-service-level-management/

When an organization acts as a service provider, it produces outputs that help its consumers to achieve certain outcomes. An output is defined as a tangible or intangible deliverable of an activity; for example, transportation from one location to another.

https://www.bmc.com/blogs/itil-key-concepts-service-management/