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The change schedule is used to help plan changes, assist in communication, avoid conflicts, and assign resources. It can also be used after changes have been deployed to provide information needed for incident management, problem management, and improvement planning

https://www.bmc.com/blogs/itil-change-enablement/#:~:text=The%20change%20schedule%20is%20used,problem%20management%2C%20and%20improvement%20planning.

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

The service request management practice supports the agreed quality of a service by handling all pre-defined, user-initiated service requests in an effective and user-friendly manner1. A service request is a request from a user or a user’s authorized representative that initiates a service action that has been agreed as a normal part of service delivery2. A user wanting to know how to create a report is an example of a service request that can be handled by the service request management practice3. The other statements are not true because:

Incident management: The incident management practice restores normal service operation as quickly as possible after an interruption or reduction in quality of an IT service1. A user wanting to know how to create a report is not an incident, as it does not affect the availability or performance of a service2.

Service level management: The service level management practice sets clear business-based targets for service performance, so that the delivery of a service can be properly assessed, monitored, and managed against these targets1. This practice does not directly handle user requests, but it may define the service level agreements (SLAs) and service level objectives (SLOs) that apply to them2.

Change enablement: The change enablement practice maximizes the number of successful service and product changes by ensuring that risks have been properly assessed, authorized, and managed within a schedule1. A change is the addition, modification, or removal of anything that could have a direct or indirect effect on IT services2. A user wanting to know how to create a report is not a change, as it does not alter the configuration or functionality of a service component2. References: ITIL Foundation - ITIL 4 Edition, page 16; ITIL® 4 – A Pocket Guide, page 37; ITIL® 4 Practice Guide: Service Request Management, page 7.

Customer: A person who defines the requirements for a service and takes responsibility for the outcomes of service consumption;

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

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/

A service level agreement (SLA) is a documented agreement between a service provider and a customer that identifies both services required and the expected level of service1. A necessity to a successful SLA is that the language and terms used in the SLA should be commonly understood by all parties, to avoid ambiguity, confusion, and disputes2. The other statements are not true because:

Base the SLA on system-based metrics that are useful to the service provider: The SLA should be based on customer-based metrics that are meaningful to the customer and reflect the value of the service2.

In order to promote consistent service, they should be carried forward, unchanged, from one year to the next: The SLA should be reviewed and updated regularly to reflect changing business needs, customer expectations, and service performance2.

Vague targets, such as those related to user experience should be avoided: The SLA should include both quantitative and qualitative targets, such as those related to user experience, satisfaction, and perception, as well as availability, reliability, and security2. References: ITIL Foundation - ITIL 4 Edition, page 16; ITIL® 4 – A Pocket Guide, page 37; ITIL® 4 Practice Guide: Service Level Management, page 8.

Don’t start from scratch and build something new without considering what you already have. It’s almost always better to improve what you currently have than to throw it all away and start again, although you must also be able to recognise when a complete replacement is, in fact, needed.

Not only is this approach less wasteful than starting from scratch – because it preserves value that you already have – but it also helps you to keep your people on board. They’re much more likely to support the changes you need if their previous contributions have been appropriately valued.

Don’t rely on metrics and reports to tell you what the current situation is. When you carry out an assessment you should observe what is happening for yourself, and just use the metrics to support your observations.

https://www.sysaid.com/blog/itil/the-7-guiding-principles-of-itil-4-practical-advice-to-help-you-make-decisions

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/

In ITIL, there are six activities in the service value chain which represent the steps an organization takes in the creation of value:

Plan

Engage

Design and Transition

Obtain/Build

Deliver and Support

Improve

https://www.bmc.com/blogs/itil-service-value-chain/

You need to use all of your resources as effectively and efficiently as you can. This means that you should automate wherever you can, and use people only for tasks that can’t be automated. It also means that you need to think carefully about what you can automate and about the circumstances where only a person will do; and about simplifying those processes you do decide to automate to eliminate wasteful or inefficient steps.

You should always optimize the work BEFORE you automate it, as automating something that is inefficient or ineffective may just result in you doing the wrong thing faster!

https://www.sysaid.com/blog/itil/the-7-guiding-principles-of-itil-4-practical-advice-to-help-you-make-decisions

CIs are simply any component that needs to be managed in order to deliver an IT service. A server, a virtual server, or even the configuration of an application could be considered a CI, for example

https://www.bmc.com/blogs/itil-asset-configuration-management/#:~:text=among%20your%20CIs-,Configuration%20items%20(CIs),considered%20a%20CI%2C%20for%20example.

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

https://assyst.ifs.com/blog/the-7-guiding-principles-of-itil-4-0

Don't over-engineer solutions. Think about what you can do now.

Like focus on value, this principle is heavily focused on the prevention of waste. Waste correlates with complexity. Higher complexity means there are more opportunities for waste to creep into a system.

Focus on delivering the desired outcome, not building the most elegant and elaborate solution. Use the minimum number of steps to deliver that outcome, ensuring you are not over-processing (delivering quality above and beyond what is required).