To understand how things have changed since Carmen Fariña became schools chancellor, consider where she has chosen to be on roughly 200 occasions this year, often five times per week: in schools.

She uses the hour-long visits to find model schools that other educators can tour and to size up principals, noting whether teachers seem surprised to see their bosses (a sign they aren’t poking into classrooms enough) and if the principals bring any deputies along for the tours (a hint they know how to delegate). She inspects students’ writing and asks the principal to show her a strong teacher in action and a weak one.

Twelve months into her stint leading the nation’s largest school system, Fariña’s attention to such details seems misplaced to some critics, who worry that it comes at the expense of big-picture thinking and suggests a shift away from the greater autonomy that principals gained under the previous administration.

But to her many admirers, the visits reflect a belief that even in a system of 1.1 million students and 75,000 or so teachers, change can happen school by school and classroom by classroom when educators are empowered, without the seismic policy shakeups that seemed to occur routinely under her recent predecessors. As Fariña, who has spent nearly half a century working in schools, likes to say, “The answers are in the classroom.” In other words, this is educator-driven education reform.

“There’s a sense,” said Alison Coviello, principal of P.S. 154 in the Bronx, “that we’re all in this together.”

When Mayor Bill de Blasio pulled Fariña from semi-retirement last January, she decided that she would have to roll back the Bloomberg-era policies she disagreed with even as she put her own into place: To “undo while [she’s] doing,” as she told Chalkbeat earlier this year.

And that’s just what she’s done. She downsized the office that helped create new schools — a signature Bloomberg initiative — while resurrecting the department devoted to teacher training. She re-empowered superintendents, who were marginalized under Bloomberg, and insisted that would-be principals and superintendents both spend more years in schools (a rejection of the Bloombergian idea that talent trumps experience). And she axed the Bloomberg policies that tied student promotion to test scores and assigned schools letter grades as she launched her own signature program, which sends educators to visit successful schools to pick up ideas.

That program, called Learning Partners, exemplifies Fariña’s approach. It is educator-led, cooperative, and subtle, allowing Fariña to spread her ideas through proxies rather than edicts.

“We have gotten more schools to change practices not by mandating, but by collaborating,” she said in an interview Monday. “I could have said across the board, ‘Every middle school needs to do X, Y and Z.’ And we didn’t do that.”

She also helped forge new contracts with the principals and the teachers unions, which had given up on negotiating with the previous administration. The teachers got a big payout in the contract (though not big enough to satisfy everyone), while Fariña was able to embed time for training and interacting with parents into teachers’ weekly schedules (at the cost of student-tutoring time, which was repurposed). Cynics charged that the city secured the contracts by giving into most of the unions’ demands, but Fariña argues that they were the product of her collaborative approach.

“What we got out of those contracts,” she said, “probably would not have been possible without that kind of partnership.”

She also helped the mayor fulfill his promise to get 53,000 four-year-olds into classrooms.

“How could I forget?” Fariña said. “Pre-K!”

For all that she has already done and undone, Fariña has a big year ahead of her. On Monday, she ticked off a few of the biggest items on her to-do list.

First, she must help de Blasio add the 20,000 additional pre-kindergarten seats he has promised, even as charter schools demand more space of their own. Then, she must turn two of his most ambitious plans into reality: to convert nearly 130 schools into service hubs for students and their families, and to turn around more than 90 low-performing schools.

That last task will be especially daunting. Rather than shut down chronically underachieving schools or replace their staffs, Fariña has proposed lifting them up through a mix of supports for students and coaching for educators. That is a big gamble, which Fariña made clear at a meeting Monday with the leaders of those struggling schools.

“I’m holding you even more accountable,” she told the principals. “Because I went out on a limb, as did Mayor de Blasio, and said, ‘We’re not closing schools. We’re giving everybody a second chance.’”