Final answer:
The flow of work in JIT systems is characterized as a pull system, which is driven by market demand and aims to increase efficiency by cutting excessive inventory and associated costs.
Step-by-step explanation:
The control of the flow of work in Just-In-Time (JIT) systems is best characterized as a pull system. Unlike the push system where work is pushed through the system on the basis of forecasted demand, the pull system works by producing only what is needed by the next stage in the process or by the final customer, effectively reducing inventory levels and potential waste in production. JIT is a lean manufacturing approach where production schedules are driven by market demand, and it seeks to increase efficiency by eliminating excessive inventory and reducing the carrying costs associated with stockpiling goods.