You are a project manager leading a team tasked with developing a new e-commerce platform for a retail company. The project involves multiple stakeholders, including the client's marketing, sales, and IT departments, as well as external vendors providing specialized services. The platform aims to enhance the company's online presence, increase sales, and improve customer experience. Given the complexity and importance of the project, you recognize the need to put together a comprehensive project quality plan. Critically discuss the primary inputs that should be considered in achieving this goal.