Final answer:
Comparative negligence is determined through investigation and analysis, agreement between parties or mediation or arbitration, and the intervention of a judge and/or jury.
Step-by-step explanation:
Comparative negligence is determined through various methods, including investigation and analysis, agreement between parties or mediation or arbitration, and the intervention of a judge and/or jury. All of these methods may be used to determine comparative negligence, depending on the specific circumstances of the case.