To best maintain productive relationships with customers and suppliers what type of communication tool is often most important?

To maintain productive relationships with customers and suppliers, clear and consistent communication is often the most important tool. email is commonly used for formal updates and documentation, while instant messaging platforms facilitate quick, real-time interactions. Regular check-ins through video calls or meetings can also strengthen relationships and ensure alignment on expectations and goals. Ultimately, the choice of communication tool should be tailored to the preferences of both parties for optimal effectiveness.