Not sure who'll have this system of government, probably Wayfarers' Haven, but anyway. The idea is that there's no one monolithic legislative body. Instead, there are a set of departments that govern different areas of life like education, agriculture, economy, energy, etc, and they and they alone can enact legislation governing their sphere. They do consult with other departments as necessary though.
In order to become a member of a department, you have to have worked in the corresponding field. Only healers can decide matters of public health, only teachers can shape education policy, and only those who have put their lives on the line in military and law enforcement and seen the effects of violence first hand can say whether war is justified.