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'''Quality Assurance''' refers to the process if developing standard operating procedures for proactively avoiding quality problems <ref name="Diffen">[https://www.diffen.com/difference/Quality_Assurance_vs_Quality_Control "Quality Assurance vs. Quality Control". Diffen website. Retrieved 03/28/2018.]</ref>. In the brewing industry, this includes avoiding off-flavors from contamination, dissolved oxygen in beer, fermentation and ingredient issues, etc. This article will focus on microbial contamination issues and methods, particularly in the area of sharing a space for both pure culture fermentation and mixed fermentationof beer.