Verwaltungszusammenarbeit

Could you please provide the full term? The string "Verwaltungszus..." could refer to several German administrative-law concepts, such as Verwaltungsakt (administrative act), Verwaltungszwang (administrative coercion), or other related terms. If you specify the exact term, I can write a concise, neutral, wiki-style article under 300 words. If you’d like, I can also draft a general overview of German administrative law concepts related to public administration concepts, once you confirm the intended term.