The Canvass is the post-election process that reviews the election materials and leads to the official results.
You can download from this page-- (1) the Canvass Precinct Form, (2) the 2024 Canvass Guide, (3) a template authorization letter for unit chairs, and (4) a PowerPoint presentation on serving as a canvass observer.
You may also be interested in Chapter 14 of the General Registrar Electoral Board (GREB) Handbook from the Department of Elections.