Which one of these is not allowed during assembly sequencing and playback?

In assembly sequencing and playback within Siemens NX, the capability to control how the assembly is presented is fundamental for clarity and comprehension. Playing in random order is not permitted because it disrupts the logical flow required for an effective understanding of the assembly process.

Sequential assembly often relies on a logical progression that mirrors how components are meant to be assembled in real-life scenarios, allowing users to follow or replay the assembly steps in a manner that reflects their intended order. This approach helps in visualizing the steps involved, understanding relationships between components, and facilitates effective training or demonstration.

While playing forward or backward, stopping mid-sequence, or advancing one frame at a time allows for interactive control and detailed examination of specific stages, randomizing the playback could lead to confusion and misinterpretation, which is why this option is restricted. Therefore, the inability to play in random order ensures that users can maintain a clear sequence during the assembly review.