Each county shall develop a written policy for classifying juvenile offenders. The policy must include methods to classify the reoffense risk and service needs of juvenile offenders. In developing its policy, each county, to the extent practicable, shall consult with the department of corrections and attempt to achieve compatibility with other counties’ classification systems. The department of corrections shall cooperate with counties in the development of their classification systems by offering training programs, explaining existing county risk assessment practices, and providing other requested services.