Ideally as a rule of thumb, you should have two leading metrics for every lagging metric. Leading metrics are performance drivers. Utilizing them allows you the opportunity to make preemptive actions to improve your chances of meeting the desired outcomes or lagging metrics. Leading metrics often measure activities or even processes. Understand that the selected metrics (much like processes, too) the organization chooses to employ will drive employee behavior as well.
Are you using leading metrics? How can we use metrics to drive behaviors?