(b) Except as otherwise provided in subdivision (c) of this section, the provisions of this Subpart shall apply to a professional educator appointed by a board of education or board of cooperative educational services for the performance of duties in instructional support services, as defined in section 30-1.1(j) of this Subpart, on or after August 1, 1975 as follows:

1. (1) A professional educator employed by a board of education or board of cooperative educational services on May 1, 2009 that was appointed to tenure or a probationary period in a tenure area identified in this Subpart for the performance of duties in instructional support services and who did not provide knowing consent to an assignment outside of his previous tenure area pursuant to section 30-1.9 of this Subpart when he was assigned by such board of education or board of cooperative educational services prior to May 1, 2009 to the performance of duties in instructional support services shall receive credit toward tenure and/or accrue tenure and seniority rights in his previous tenure area from the initial date of his assignment to the performance of such duties and shall continue to receive tenure and/or seniority rights in his previous tenure area while assigned to perform duties in instructional support services.
2. (2) A professional educator employed by a board of education or board of cooperative educational services on May 1, 2009 who was appointed by such board of education or board of cooperative educational services prior to May 1, 2009 for the performance of duties in instructional support services, and who was appointed to tenure or a probationary period in an improper tenure area or a tenure area not authorized under this Subpart based upon the performance of such duties, shall be deemed to have been appointed or assigned by such board of education or board of cooperative educational services to serve in a tenure area for which he holds the proper certification as described in section 30-1.9(b) of this Subpart as it exists on May 1, 2009, from the initial date of his assignment and shall continue to receive credit toward tenure and/or accrue tenure and seniority rights in such tenure area while assigned to perform duties in instructional support services provided that he holds the proper certification for such tenure area.
3. (3) Any board of education or board of cooperative educational services that employs a professional educator on May 1, 2009 who has not been appointed to tenure or a probationary period in a tenure area and is performing duties in instructional support services, shall make a probationary appointment in accordance with the provisions of section 30-1.9(b) of this Subpart by July 1, 2009 if the board desires to continue to employ such professional educator for instructional support services, provided that the professional educator meets the requirements of section 80-5.21 of this Title. Thereafter, appointments on tenure shall be made in accordance with the provisions of this Subpart.
4. (4) Any board of education or board of cooperative educational services that assigns a professional educator to the performance of instructional support services on or after May 1, 2009 who has previously been appointed to tenure or a probationary period by such board in a tenure area identified in this Subpart shall credit the professional educator with tenure and seniority rights in their existing tenure area while assigned to perform duties in instructional support services.
5. (5) Any board of education or board of cooperative educational services that appoints a professional educator on or after May 1, 2009 for the performance of duties in instructional support services shall make probationary appointments and appointments on tenure in accordance with section 30-1.9(b) of this Subpart.

(c) The provisions of this Subpart shall apply to a professional educator employed by a board of cooperative educational services to devote a substantial portion of his time to the provision of instructional support services on or after May 20, 2011 as follows:

1. (1) A professional educator employed by a board of cooperative educational services to devote a substantial portion of his time to the provision of instructional support services on May 20, 2011, who was previously appointed by the board to tenure or a probationary period in a tenure area identified in this Subpart shall either:

   1. (i) continue to receive credit toward tenure and/or accrue tenure and seniority rights in his previous tenure area from the initial date of his assignment and continue to receive tenure and/or seniority rights in his previous tenure area while assigned to devote a substantial portion of his time to the provision of instructional support services; or
   2. (ii) if the professional educator provides knowing consent to the board of cooperative educational services to change his tenure area pursuant to section 30-1.9 of this Subpart by June 20, 2011, he may receive credit toward tenure and/or accrue tenure and seniority rights in one of the special subject tenure areas of instructional support services established in section 30-1.8 of this Subpart, from the date of his initial assignment to a position where he devoted a substantial portion of his time to the provision of such instructional support services and he shall continue to receive tenure and seniority rights in that tenure area while assigned to a position where he devotes a substantial portion of his time to the provision of instructional support services appropriate for such tenure area.
2. (2) Any board of cooperative educational services that appoints or assigns a professional educator on or after May 20, 2011 to devote a substantial portion of his time to the provision of instructional support services shall make probationary appointments and appointments on tenure in accordance with section 30-1.8(e) of this Subpart.
3. (3) Any board of cooperative educational services that appoints a professional educator on or after May 20, 2011 to devote a substantial portion of his time to instructional support services as a result of a board of cooperative educational services taking over a program formerly operated by a school district or a county vocational education and extension board pursuant to section 3014-a of the Education Law, shall credit the professional educator with tenure and seniority rights in the special subject tenure area for instructional support services established in section 30-1.8(e) of this Subpart from the initial date of his assignment to the performance of instructional support services in the school district or county vocational education and extension board and shall continue to credit the professional educator with tenure and/or seniority rights in such tenure area while he is assigned to devote a substantial portion of his time to the performance of instructional support services in such tenure area at the board of cooperative educational services.
4. (4) Any board of education that appoints a professional educator on or after May 20, 2011 to devote a substantial portion of his time to instructional support services as a result of a school district taking over a program formerly operated by a board of cooperative educational services pursuant to section 3014-b, where the professional educator is serving in an instructional support services tenure area pursuant to section 30-1.8(e) of this Subpart, shall credit the professional educator with tenure and seniority rights in a tenure area for which he holds the proper certification as described in section 30-1.9(b) of this Subpart, from the initial date of his assignment to the performance of instructional support services in the board of cooperative educational services and shall continue to credit such professional educator with tenure and/or seniority rights in such tenure area while he is assigned to devote a substantial portion of his time to the performance of instructional support services provided that he holds the proper certification for such tenure area.

(d) The provisions of this Subpart shall apply to a professional educator employed by a school district or board of cooperative educational services to devote a substantial portion of his or her time to the provision of instruction in computer science, on or after August 1, 1975, as follows:

1. (1) A professional educator employed by a school district or board of cooperative educational services on September 1, 2023 who was previously appointed by the board to tenure or a probationary period in a tenure area identified in this Subpart shall either:

   1. (i) continue to receive credit toward tenure and/or accrue tenure and seniority rights in his or her previous tenure area from the initial date of his or her assignment and continue to receive tenure and/or seniority rights in his or her previous tenure area while assigned to devote a substantial portion of his or her time to the provision of instruction in computer science: or
   2. (ii) if the professional educator provides knowing consent to the school district or board of cooperative educational services to change his or her tenure area pursuant to section 30-1.9 of this Subpart by September 1, 2023. he or she may receive credit toward tenure and/or accrue tenure and seniority rights in the special subject tenure area of computer science, established in section 30-1.8 of this Subpart, from the date of his or her initial assignment to a position where he or she devoted a substantial portion of his or her time to the provision of instruction in computer science and he or she shall continue to receive tenure and seniority rights in that tenure area while assigned to a position where he or she devotes a substantial portion of his or her time to the provision of computer science instruction appropriate for such tenure area.
2. (2) Any school district or board of cooperative educational services that appoints or assigns a professional educator on or after September 1, 2023 to devote a substantial portion of his or her time to the provision of computer science instruction shall make probationary appointments and appointments on tenure in accordance with section 30-1.8(e) of this Subpart.
3. (3) Any board of cooperative educational services that appoints a professional educator on or after September 1, 2023 to devote a substantial portion of his or her time to computer science instruction as a result of a board of cooperative educational services taking over a program formerly operated by a school district or a county vocational education and extension board pursuant to section 3014-a of the Education Law, shall credit the professional educator with tenure and seniority rights in the special subject tenure area for computer science instruction established in section 30-1.8(e) of this Subpart from the initial date of his or her assignment to the performance of computer science instruction in the school district or county vocational education and extension board and shall continue to credit the professional educator with tenure and/or seniority rights in such tenure area while he or she is assigned to devote a substantial portion of his or her time to the performance of computer science instruction in such tenure area at the board of cooperative educational services.
4. (4) Any board of education that appoints a professional educator on or after September 1, 2023 to devote a substantial portion of his or her time to computer science instruction as a result of a school district taking over a program formerly operated by a board of cooperative educational services pursuant to section 3014-b of the Education Law, where the professional educator is serving in a computer science instruction tenure area pursuant to section 30-1.9(b) of this Subpart, shall credit the professional educator with tenure and seniority rights in a tenure area for which he or she holds the proper certification as described in section 30-1.9(b) of this Subpart, from the initial date of his or her assignment to the performance of computer science instruction in the board of cooperative educational services and shall continue to credit such professional educator with tenure and/or seniority rights in such tenure area while he or she is assigned to devote a substantial portion of his or her time to the performance of computer science instruction provided that he or she holds the proper certification for such tenure area.