are the individual objects within the simulation. These can be "dynamic" (moving through the system, like customers in a bank) or "static" (resources like a teller desk). Each entity has attributes —specific characteristics like speed, priority level, or service time—that determine how it interacts with the rest of the model. 3. States and Variables
are the components that provide service to entities. Because resources are usually limited, they create constraints . The interaction between entities demanding service and the limited capacity of resources is what typically creates bottlenecks, making this element essential for problem-solving. 6. Stochastic (Random) Components Elements of Simulation
These track the status of the system (e.g., the number of people in a queue). are the individual objects within the simulation
Time is the dimension that brings a simulation to life. The tracks the passage of time, which can be accelerated (modeling years of climate change in seconds) or slowed down (analyzing a high-speed engine failure) depending on the goal of the study. Conclusion The interaction between entities demanding service and the
The first step in any simulation is defining the —the specific part of the real world being studied. Establishing boundaries is critical; you must decide what is internal to the model and what external factors (the environment) will influence it. For example, in a flight simulator, the aircraft is the system, while wind and air pressure are environmental inputs. 2. Entities and Attributes
A simulation is more than just a model; it is a dynamic laboratory. By balancing these elements—entities, states, events, and randomness—researchers can test "what-if" scenarios in a risk-free environment, providing insights that would be too expensive, dangerous, or slow to observe in reality.
Simulations are driven by , which are occurrences that change the state of the system. In a "Discrete Event Simulation," the clock jumps from one event to the next (e.g., a customer arriving or leaving). The logic or rules of the simulation dictate exactly what happens when an event occurs, ensuring the model follows "real-world" physics or operational procedures. 5. Resources and Constraints