Updated September 2026
Evidence library & parent experiences
Primary documents first. Always read them yourself; links and locations can change.
External evidence library
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Cass Review (NHS England, 2024) — Independent review of gender identity services for children and young people.
Final report page · PDF · UK National Archives copy · York University systematic reviews (BMJ ADC) -
Ontario HPE curriculum — the expectations PPM 162 addresses.
Grades 1–8 PDF (2019) · Digital 1–8 · Grades 9–12 PDF (2015) - PPM 162 — Full text on ontario.ca
- Society for Evidence-Based Gender Medicine (SEGM) — segm.org
- Ontario Human Rights Code — R.S.O. 1990, c. H.19
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DDSB Student Census (identity questions; Grade 7–12 sexual orientation 74% heterosexual; about 2% gender-diverse in one reported cut).
Student Census page -
DDSB Human Rights and related procedures
Human Rights page · Student rights sheet (PDF) - MFIPPA — Municipal Freedom of Information and Protection of Privacy Act
- School councils — O. Reg. 612/00
Anonymized parent experiences
These composite examples are based on patterns commonly reported by Durham and Ontario parents. Names and identifying details have been removed. They are illustrative, not legal advice.
Example A — Late PPM 162 notice. A parent received a PPM 162 notice only five school days before the sexual-health unit began. They immediately emailed the principal citing the 20-day requirement, requested the exemption anyway, and copied the superintendent. The school provided alternative supervision and later improved its notice timing.
Example B — Preferred name without notification. A parent discovered through a report card that staff had been using a different first name and pronouns for several months. They requested a written explanation, asked that legal names be used in formal communications, and raised the issue at School Council.
Example C — School Council motion. Several parents coordinated to attend School Council and passed a motion requesting that curriculum outlines and identity-related guest speakers be posted at least two weeks in advance. The principal agreed to improve transparency for the rest of the year.
Outcomes vary. Persistent, polite, written documentation produces the best results.