Kenneth Boulding is an economist and founder of the Society for General Systems Theory. The five main classes of service systems with the systems hierarchy include integrative systems, exchange systems, threat systems, parasitic systems, and . prey/predator systems

self-abusive systems

peer systems

achievement systems

Neuronfan the three major causes that can contribute to mental health disorders are physical, psychological, and environmental. physical factors are genetics, brain damage, exposure to toxins, and poor nutrition. psychological factors are early loss of a family member, severe trauma, and childhood neglect. environmental factors are death/divorce, dysfunctional family life, poverty, change, and substance abuse.