The ITIL practice that needs people who understand complex systems and have creative and analytical skills is Problem management.

Problem management is the process of identifying, managing, and preventing problems that affect the delivery of IT services.

This requires a deep understanding of how IT systems work, as well as the ability to think creatively and analytically to identify and solve problems. Ref 5.2.8 ITIL4 Foundation

The option "Detailed procedures for the diagnosis of incidents" is NOT usually included as part of incident management.

Incident management typically involves the logging, classification, prioritization, and initial diagnosis of incidents, as well as communication with the user and the escalation of incidents, if necessary. However, detailed procedures for the diagnosis of incidents often fall under the purview of problem management, which seeks to identify the root cause of incidents and find long-term solutions. Ref 5.2.5 ITIL4 Foundation

The correct answer is: An organization should always develop competencies in methodologies and techniques that will meet their needs.

This is because different organizations will have different needs, and there is no one-size-fits-all approach to continual improvement.

By developing competencies in a variety of methodologies and techniques, organizations can ensure that they have the tools they need to assess their current state and identify opportunities for improvement. Ref 4.6 ITIL4 Foundation

The ITIL service value system discourages organizational silos.

Organizational silos are self-contained units within an organization that are focused on their own goals and objectives, and that do not interact effectively with other units.

This can lead to problems such as duplication of effort, lack of communication, and poor decision-making. Ref 4.1 ITIL4 Foundation

The purpose of the Deliver and support value chain activity is to provide services to agreed specifications.

This includes understanding stakeholder needs, understanding the organization's service vision, and meeting stakeholder expectations for time to market. Ref 4.5.6 ITIL4 Foundation

Utility is the functionality offered by a product or service to meet a particular need.

Utility can be summarized as what the service does and can be used to determine whether a service is fit for purpose.

To have utility, a service must either support the performance of the consumer or remove constraints from the consumer. Many services do both. Ref 2.5.4 ITIL4 Foundation

Continual improvement should be everyone's responsibility in an organization.

This means that everyone should be looking for ways to improve the way things are done, whether it's in their own work or in the organization as a whole. Ref 5.1.2 ITIL4 Foundation

The correct answer is There can be more than one CIR in an organization.

A continual improvement register (CIR) is a repository for improvement ideas. It can be used to track and manage improvement ideas from identification through final action. 

There are no hard and fast rules about how many CIRs an organization should have.

Some organizations may choose to have a single CIR for the entire organization, while others may choose to have multiple CIRs, each focused on a specific area of improvement. Ref 5.1.2 ITIL4 Foundation

Warranty is the assurance that a product or service will meet agreed requirements.

In the context of service management, warranty refers to the level of service that is promised to service consumers.

This level of service is typically defined in a service level agreement (SLA). The SLA will specify the availability, performance, and other attributes of the service that are expected by the service consumers. Ref 2.5.4 ITIL4 Foundation

The Start where you are guiding principle recommends using existing services, processes and tools when improving services. This principle encourages organizations to build on what they already have, rather than starting from scratch.

This can help to save time and money, and it can also help to ensure that the new services are compatible with the existing environment. Ref 4.3.2 ITIL4 Foundation