From Caesars Lean case please answer the following question:

Assume service score for the area you manage, Harrah's metropolis hotel housekeeping, have declined over the past year. As a part of the lean rollout at Metropolis, you and some of front line employees will participate in a Kaizen event focused on improvement guestroom housekeeping operations. What Key performance indicators would you propose to track to determine whether the change implemented through the Kaizen efforts actually improve performance?