[C] Impression Share? High or Low
Find impression share by running an impression share report. Beware about the sensitivity some types of revisions can have on impression share. When an account is running over 75% impression share it should be carefully trimmed, not hacked! So keep in mind the degree to which impression share might be considered high or low. On the ends of the spectrum, it’s easy: less than 10% = clearly low; over 90% = clearly high.
Make sure the report dates are representative of the account’s current condition. If you’ve made significant changes a week ago, then the impression share report should show activity only for the period since that event.