Final answer:
The principle needed when not everyone who mediates is at an 'even table' is building in consultation before, feedback after.
Step-by-step explanation:
The principle needed when not everyone who mediates is at an 'even table' is building in consultation before, feedback after. This principle emphasizes the importance of involving stakeholders in decision-making processes and seeking their input before making decisions. It also emphasizes the importance of obtaining feedback from stakeholders after decisions are made to ensure their voices are heard and their concerns are addressed.