How can top-managers assure that middle and low-level managers are on the same page as they are regarding the new direction for the company?

“Successful execution depends heavily on how well middle-management implements the goals and objectives chosen by top-management to support the new vision for the company. How can top-managers assure that middle and low-level managers are on the same page as they are regarding the new direction for the company? Present an implementation plan that addresses this issue.”