Answer:
past performance, overall goal, other's performance.
Explanation:
Productivity can be measured to three main things, past performance, overall goal, others performance. Each of these are effective and meaninful factors to compare productivity to. They allow you to determine if productivity is increasing, decreasing, or if it could be better. If other individuals perfomance is better than yours and they are similar to you in every other factor then that means that your productivity can and should be better than what it currently is. Therefore, each one of these comparisons provide useful and valuable data.
