PrinciplesOfProductDevelopmentFlow.ManagingQueues

Back

> Product development inventory is physically and financially invisible
 * Q1:    The Principle of Invisible Inventory **

> Queues are the root cause of the majority of economic waste in product development
 * Q2:    The Principle of Queueing Waste **

> Capacity utilization increases queues exponentially
 * Q3:    The Principle of Queueing Capacity Utilization **

> Most of the damage done by a queue is caused by high-queue states
 * Q4:    The Principle of High-Queue States **

> Variability increases queues linearly
 * Q5:    The Principle of Queueing Variability **

> Operating at high levels of capacity utilization increases variability
 * Q6:    The Principle of Variability Amplification **

> Serve pooled demand with reliable high-capacity servers
 * Q7:    The Principle of Queueing Structure **

> Adjacent queues see arrival or service variability depending on loading
 * Q8:    The Principle of Linked Queues **

> Optimum queue size is an economic trade-off
 * Q9:    The Principle of Queue Size Optimization **

> Queue cost is affected by the sequence in which we handle the jobs in the queue
 * Q10:    The Principle of Queueing Discipline **

> Use CFDs to monitor queues
 * Q11:    The Cumulative Flow Principle **

> Wait Time = Queue Size / Processing Rate
 * Q12:    Little’s Formula **

> Don't control capacity utilization, control queue size
 * Q13:    The First Queue Size Control Principle **

> Don't control cycle time, control queue size
 * Q14:    The Second Queue Size Control Principle **

> Over time, queues will randomly spin seriously out of control and will remain in the state for long periods
 * Q15:    The Diffusion Principle **

> We cannot rely on randomness to correct a random queue
 * Q16:    The Intervention Principle**

Back