He lists seven: people (this means internal morale and union rapport), institutional reform (Mr. Sander says the authority operates as seven separate fiefs and needs a common umbrella), customer service (more to the point, a lack thereof), projects and planning (the Second Avenue subway; links to Jets and Giants games; floodproof stations), security (he meets weekly with the Police Department), and last but not least, sustainability. Mr. Sander is a sustainability wonk, too.
Source: wiktionary