The 'Manage by Stages' principle in PRINCE2 allows the project board to control the project effectively by reviewing its viability at the end of each management stage. This review process provides regular control points where the continuation of the project is assessed based on its performance and continued business justification. References: PRINCE27 Foundation Handbook and official training materials.

In PRINCE2, the creation of a highlight report is a time-driven control, typically scheduled at regular intervals, such as weekly or monthly during a stage. This report provides the Project Board and other stakeholders with a summary of the stage status, and it is triggered by the passage of time, not by specific events or exceptions within the project.References: = PRINCE2 7 Foundation Training Manual and official PRINCE2 website documentation

In the PRINCE2 customer/supplier environment, the supplier's responsibility includes providing the resources and skills necessary to deliver the desired result. This involves ensuring that the necessary personnel, technology, and other resources are available to meet the project's requirements effectively. References:
PRINCE2Foundation official study materials.

In the 'planning' technique, a team manager should break down the cost of delivering a work package during the 'Preparing estimates' step. This involves estimating the resources and time required to deliver each component of the work package, which are critical for budgeting and resource allocation. References:
PRINCE2 Foundation course material on planning techniques and project management documentation.

An effective project team in PRINCE2 should be diverse, consisting of individuals with a variety of skills, abilities, and viewpoints. This diversity helps to ensure that the team can handle various aspects of the project effectively, bringing different perspectives to problem-solving and decision-making, which enhances the overall capability of the project team.References: (PRINCE2 7 Foundation Handbook, AXELOS)