How did the ATR pool come to be?
The
 ATR pool — a reserve pool of teachers working as substitutes but 
without permanent assignments — was a personnel policy devised by the 
Bloomberg administration that was poorly designed and never effectively 
implemented, particularly after the pool expanded in the wake of school 
closings during the Bloomberg years. As the school-closing mania has 
receded, the size of the pool has diminished.... 
from UFT website, http://www.uft.org/press-releases/atr-qa
Jeff Kaufman posted on ICE(the caucus) -News.
 
UFT had nothing to do with creating the ATR pool!?!
Before you read the UFT press release on ATRs, I though a review of the blogs Jeff published on the ICE blog in October 2005 would give you a good sense of what was going on in real time.
In reverse order - read from bottom up.
PRESS RELEASES
ATR Q&A
For immediate release
AUGUST 21, 2017
The
 recent Department of Education announcement about assigning teachers 
from the ATR pool to schools on a more permanent basis has awakened the 
usual opposition from the "school reform" crowd.
Below is a Q&A designed to provide accurate information to those who have questions about the issue.
"Teachers
 in the ATR pool are a valuable resource for the system and provide 
needed services to schools." —UFT President Michael Mulgrew
How did the ATR pool come to be?
The
 ATR pool — a reserve pool of teachers working as substitutes but 
without permanent assignments — was a personnel policy devised by the 
Bloomberg administration that was poorly designed and never effectively 
implemented, particularly after the pool expanded in the wake of school 
closings during the Bloomberg years. As the school-closing mania has 
receded, the size of the pool has diminished.
How do teachers end up in the pool?
Most
 of the teachers in the pool are there because their schools or their 
programs closed; a minority have been the subject of some kind of 
disciplinary action, though that action may have led only to a brief 
suspension or a fine of a few hundred dollars. The overwhelming majority
 of teachers in the ATR pool have received positive evaluations 
(Effective, Highly Effective or, for those rated under the previous 
system, Satisfactory).
How does the program now work?
ATR
 teachers are in the schools every day. Some get longer assignments, but
 many rotate among schools on a monthly basis, filling in for teachers 
who are sick or on some kind of leave.
Do the ATRs cost principals money?
ATRs
 on rotating assignments save the school system the cost of hiring a 
substitute. The Department of Education has created a number of 
financial incentives for principals to encourage them to hire ATRs on a 
more permanent basis, but the fact is that an ATR's salary constitutes a
 tiny percentage of a building's total teacher payroll, which for even a
 small school can exceed $3 million annually.
How will the new program work?
A
 number of ATRs will be assigned (in license) to schools ONLY where the 
principal has been unable to fill an open position. Without the presence
 of such an ATR, students would be faced with occasional and expensive 
part-time substitutes or a group of ATR teachers rotating in and out 
every month.
Mr. Mulgrew told the New York Times, “What we’re trying to do is give a more stable educational environment for the students.”
An
 ATR in this type of provisional assignment will become part of the 
school's regular faculty the next year if the teacher is rated Effective
 or Highly Effective.
What if the ATR and the principal don't see eye-to-eye?
To
 quote from the recent agreement with the DOE : "...AT ANY TIME [caps 
added] after a provisional assignment is made a principal can request 
the removal of the ATR from this assignment and the ATR can be returned 
to the ATR pool..."
What is the role of the disciplinary process?
Under
 state law, tenured teachers are guaranteed due process, including a 
hearing before an independent arbitrator, if they have been accused of 
some kind of misbehavior. Many disciplinary case brought by the 
Department of Education are not serious enough to justify a teacher 
being terminated. Cases are often resolved, either by an agreement or by
 an arbitrator’s decisions, with a fine or a suspension. Fines can be as
 little as $250, and suspensions as brief as one week. But even penalties like these can land a teacher in the ATR pool under current DOE practice.