Who is responsible for ensuring the successful implementation of a project or business change?

The correct choice is the project champion. A project champion plays a crucial role in the successful implementation of a project or business change by actively advocating for the project, securing resources, and ensuring stakeholder engagement. This individual acts as a bridge between the project team and upper management, fostering support and commitment from key stakeholders. The project champion’s dedication and enthusiasm can be vital for maintaining momentum and addressing any challenges that arise during the project lifecycle.

In contrast, while other roles like the project manager, project sponsor, and team leader are important, they have different focuses. The project manager is responsible for the day-to-day management of the project, ensuring that tasks are completed on time and within budget. The project sponsor provides overall direction, support, and funding, acting as a senior executive who authorizes the project. The team leader oversees specific aspects of the project team, focusing on delegation and team dynamics. Each of these roles contributes to the project's success but does not encompass the broad advocacy and support responsibilities that define the project champion’s role.