I'm actually defining this process for the first time in my current company. I'll explain my philosophy behind performance levels and goals. I'd love any feedback. I'm specifically trying to make this an actionable process.
First, the levels, because I perhaps have a different interpretation of these than I'm used to seeing. There are essentially three levels that correspond to performance compared to expectations. So underperforming, performing, and overperforming. Only underperforming carries a negative connotation [0], because it means that you are not meeting the expectations for your level. In contrast, overperforming means that you are reaching beyond your current level.
So, hopefully we have zero people underperforming. Also, hopefully we have the vast majority of people performing. Because overperforming basically means we need to be finding an expanded role for that person, which we may or may not have. If too many people are overperforming, then we can maybe expect turf wars as people start trying to expand their role without guidance, which is terrible for morale. Hopefully we can balance overperformers with growth, so we are moving people to expanded roles and then filling in below with new hires.
So, given this leveling, there are two types of goals: baseline and growth. Baseline goals apply to the entire team and define those baseline expectations for that team. Meeting these goals will keep the team out of underperforming territory [1]. Growth goals are tailored to a specific individual, and detail specific targets to work on. The idea is to provide meaningful growth to the person and their capabilities, with an eye towards expanding their role. Over time, having and meeting these growth goals will result in overperforming as the individual fills that expanded role more and more.
[0] Caveat: I would expect a junior-level to be growing. So juniors who are not overperforming are worrisome.
[1] There's a bit of issue here in team vs individuals. Generally, as long as the team is successful, I tend to err on the side of overrating individuals. After all, part of the reason we make teams is to allow them to shore up weaknesses and play to strengths. However, I leave in an out by having a baseline goal centered on teamwork and team success. So if someone is not contributing as expected to the team, there's something to call them out on.