As stained glass has endured a revival at the end of the 19th Century, its manufacturing process has remained largely unchanged until the present day. Stained-glass restoration uses the same techniques as did 19th Century stained-glass production, but they are completed by specific steps, like researching and surveying. This course focuses on the restoration of the stained-glass windows of the Roman-Catholic church in Târgu-Secuiesc, a complex process, beginning on-site and mainly completed in the workshop.