> ## Documentation Index
> Fetch the complete documentation index at: https://docs.sightlinebehavior.com/llms.txt
> Use this file to discover all available pages before exploring further.

# Supported features and limitations

> Check supported iPhone methods, recording controls, and transfer limitations.

Choose how you will record before starting. iPhone can send scores to a nearby computer, or record an observation that you prepared on the computer and sent to the phone before leaving.

Both options require compatible app versions and Pro or an active Pro trial on the computer. See [Overview and requirements](/companion/overview) before setup.

## Recording methods

The table shows which device to use for each method. “Pause on” means **Pause to score each interval** is enabled. For Partial and Whole Interval, you can score while observing either way; the pause adds a check before **Continue**.

| Method | iPhone, computer nearby | iPhone, away |
| - | - | - |
| Partial Interval, pause off | Mark occurrence in the current interval. | Mark occurrence in the current interval. |
| Whole Interval, pause off | Tap a behavior if it stops or is absent during the current interval. | Available through **Send to phone**; uses whole-interval scoring rules. |
| Partial or Whole Interval, pause on | Mark during the interval; check the scores at the pause, then **Continue**. | Mark during the interval; check the scores at the pause, then **Continue**. |
| Momentary Time Sampling (MTS) | Select occurrences at the prompt, then **Continue**. Unselected behaviors become nonoccurrence. | Available through **Send to phone**. Answer prompts on iPhone. |
| Frequency | Count occurrences; **Undo** removes the latest Companion event. | Count occurrences; **Undo** removes the latest event. |
| Duration | Start and stop behavior episodes. | Cannot be sent to phone. |
| Latency | **Present stimulus**, record the response, or select **No response**. | Cannot be sent to phone. |
| ABC | Record antecedent, behavior, and consequence on iPhone. | Record on iPhone. |
| Anecdotal | Record voice notes; type and edit on computer. | Record voice notes for transcription on return. |

See [Record with your computer nearby](/companion/record-nearby) for device-specific controls. The [away walkthrough](/companion/record-away) demonstrates Partial Interval with the pause off; its tap instructions do not apply to Whole Interval or MTS.

### Interval scoring and timing

With **Partial Interval** and **Pause to score each interval** off, Sightline records ✕ for any behavior you leave unchanged. If you miss an interval, clear its score in Results after saving or returning the observation. Partial-interval percentages show the share of scored intervals marked ✓, not how long the behavior lasted.

For **Partial or Whole Interval** with the pause on, the phone keeps the same scoring cards available during the interval and at the pause. Check the scores before selecting **Continue**; you do not need to enter them again.

For nearby **MTS** on iPhone, **Continue** records unselected behaviors as ✕. If you missed the sample, clear it on the computer after continuing. See [Interval Recording](/interval-recording) for measurement guidance.

For nearby Frequency peer comparison, use the **Student** or **Peer** control for the person observed. Interval peer comparison uses the current target or peer interval shown by the observation.

## Starting, pausing, correcting, and ending

| Task | Computer nearby | Away from computer |
| - | - | - |
| Prepare | Computer. | Computer, then **Send to phone** before leaving. |
| Start | Computer **Start** or iPhone **Begin** on the prepared nearby observation. | iPhone **Begin**. |
| Pause and resume | Computer **Pause** and **Resume**. | No manual Pause control. Interval checks and MTS prompts stop the timer, but you cannot pause it at another time. |
| Correct earlier data | Use computer controls for the method. Phone Frequency Undo is limited to the latest Companion event. | Correct the current mark or use Frequency Undo on iPhone where available. Review earlier data in Results after return. |
| End and save | End and save on computer. | iPhone **End → End observation**, then return to the computer. |
| Confirm completion | Open the saved observation on computer. | Open the returned observation on computer. |

Only one away observation can run on iPhone at a time. Begin and end it on iPhone. With **No limit** in the partial-interval example, ending during an interval leaves that unfinished interval out of the saved record.

Prepare activity choices on the computer. See [Activity Context](/activity-context).

## Voice notes

Voice notes are limited to 20 seconds per clip. iPhone uses **Hold to record**.

The computer needs its transcription model to turn clips into text. Nearby clips transfer during the session; away clips are processed after return. A saved observation can still contain a failed transcription, so check the text separately from the scores.

See [Voice notes](/companion/voice-notes) for microphone setup, model preparation, and retry instructions.

## Connections and stored observations

Nearby recording needs the phone connected to the computer; a lost connection does not switch the observation into away mode. Check the active observation when returning from another app or waking a device.

After an away session, **Ready to send to your computer** means the observation is waiting to transfer. Keep it on the phone until you can open and check the saved record on the computer. If it has not transferred, follow the troubleshooting steps before forgetting a device, changing pairing, deleting the observation, or reinstalling.

Follow [Companion troubleshooting](/companion/troubleshooting) for a connection problem, interrupted observation, or return that needs attention.


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