If Bill de Blasio had built his mayoral campaign around a promise to reduce crime, we'd simply tally up the number of murders, rapes, assaults and other offenses in a year or two to see whether he was succeeding or not. If he'd campaigned on a vow to improve schools, we could (with caution) look at test scores or graduation rates.

As it turns out, de Blasio chose a bigger, more amorphous target: inequality. Unlike former Mayor Bloomberg, who committed to reducing homelessness by two-thirds and to substantially reducing poverty (he failed on both counts), de Blasio never made a specific promise of how much he would reduce inequality. But he did vow to reduce it, and to hold him accountable, we need to come up with a consistent way to measure progress against inequality.

So I asked a group of policy experts—some of whom are involved in the transition and couldn't be quoted by name—to suggest how to track de Blasio's impact.

Read what they said here.