Keeping in mind that best practices around self-identification surveys are always evolving, here are some resources for further consultation: 

Glossaries 

Egale Canada. 2SLGBTQI Glossary of Terms: https://egale.ca/awareness/glossary-of-terms/.  

Government of Canada. Gender and Sexual Diversity Glossary. https://www.btb.termiumplus.gc.ca/publications/diversite-diversity-eng.html. 

Canadian Race Relations Foundation. CRRF Glossary of Terms. https://www.crrf-fcrr.ca/en/resources/glossary-a-terms-en-gb-1?letter=a&cc=p. 

Intersectional Approaches  

Bowleg, Lisa. When Black + Lesbian + Woman =/ Black Lesbian Woman: The Methodological Challenges of Qualitative and Quantitative Intersectionality Research, in Sex Roles, 59(5): 312-325, 2008: When Black + Lesbian + Woman ≠ Black Lesbian Woman: The Methodological Challenges of Qualitative and Quantitative Intersectionality Research (researchgate.net)

Christoffersen, Ashlee. Research and data briefing: Intersectional approaches to equality research and data, Equality Challenge Unit, 2017.

Smith, Malinda S.. Equity at Canadian Universities: National, Disaggregated and Intersectional Data, Academic Women’s Association, University of Alberta, June 2018: https://uofaawa.wordpress.com/2018/06/22/equity-at-canadian-universities-national-disaggregated-and-intersectional-data/. 

Frequently Asked Questions Webpages 

Government of Canada. Self-Identification Data Collection in Support of Equity, Diversity, and Inclusion, 2021: Self-Identification Data Collection in Support of Equity, Diversity, and Inclusion - Science.gc.ca.  

Toronto Metropolitan University, Diversity Self-ID FAQ: Self-ID FAQs - Diversity Self-ID - Toronto Metropolitan University (torontomu.ca)

University of British Columbia, Employment Equity Census FAQ. https://equity.ubc.ca/how-we-can-help/employment-equity/employment-equity-census-faqs/