$1\mathrm{.}1.$ Variability of the arrival process in a queuing system causes waiting times$\mathrm{.}1\mathrm{.}2.$ Customer waiting time can be eliminated in a queuing system if the random fluctuations in the processing time are completely eliminated$\mathrm{.}1\mathrm{.}3.$ If average capacity is greater than the average demand, then there are no customers waiting in the system$\mathrm{.}1\mathrm{.}4.$ In Toyota Production system, reducing inventory will make production problems visible$1\mathrm{.}5$ project management: delaying activity NOT on critical path may help with resource management without delaying the entire project.