Wikipedia:Articles for deletion/German Operations Research Society
per David's source finds and the independent sources in :de:Gesellschaft für Operations Research. Operations research is definitely a real field of study, although it used to be bigger than it is today. The independent source finds show marginal notability, and the fact that this is a bona fide national organization contributes to notability per 
— User:Mark, 00:22, 10 May 2015 (UTC)
Stance: keep
Cited policy: WP:NGO (Wikipedia:Notability)