# Interrupts

Interrupts (or failure/stop) help the user generate real-world behavior to flow in a Discrete Rate Simulation. Interrupts are directly related to reliability. Reliability is defined as the probability that a system will perform its intended function for a specified period of time. For example, a reliability of 0.8 at 100 hours indicates that after 100 hours, there is an 80% chance that the system is still functioning.

Interrupts can be imported or added directly in the Constraints pane.

Each Interrupt has the following parameters:

Name

Interrupt Type

Uptime Distribution

Uptime Parameter 1

Uptime Parameter 2

Downtime Distribution

Downtime Parameter 1

Downtime Parameter 2

Interrupts are often classified using the bathtub curve or failure rate graph. This graph is used in reliability engineering and deterioration modeling. The 'bathtub' refers to the shape of a line that curves up at both ends, similar in shape to a bathtub. The bathtub curve has 3 regions:

The first region has a decreasing failure rate due to early failures.

The middle region is a constant failure rate due to random failures.

The last region is an increasing failure rate due to wear-out failures.

See the Distributions section for more information.

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