
The author presents the problem of legal admissibility and general legal status of the monistic (one-tier) system in a national-law cooperative (including especially the use of this system as a rule, option – aside or in another relationship with the dualistic model or other models of governance) in selected foreign legal systems, first and foremost European, to identify general arguments, resulting from comparative legal analysis, for the introduction of such a system in the Polish-law cooperative. The author presents the essential characteristics of the monistic system as a governance model in general and then specifies the existing scope of legal admissibility of application of the monistic system in managing organisational units in the Polish legal system. This is a necessary background for presenting general remarks and basic relationships in the area of influence of legal cultures (traditions) – Germanic or Romanic – on the application (as a rule or option) or even differently – the exclusion of the application of monism in the management of a cooperative established under national law in selected foreign legal systems, and then – in the form of longer conclusions – the most important arguments for extending the use of the monistic system (monism) in management in Polish legal system onto Polish-law cooperatives and the conclusion in this respect.