$1.$ Explain what is meant by model, simulation, system, system simulation and simulation model? Next, give your opinion regarding the usefulness, advantages and disadvantages of models and system simulation results in decision making, especially in manufacturing and service companies?

$2.$ Explain briefly with examples the stages of system simulation activities!

$3.$ Name some software or tools used to simulate systems that are widely used by industrial engineers.

$4.$ Give examples of the application of the following statistical concepts and models in manufacturing and service industries:

$-$ Discrete Distribution $($dynamic$/$static$)$

$-$ Continuous Distribution $($static$/$dynamic$)$

$-$ Poisson distribution

$-$ Exponential Distribution