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  • PhET io sonification wrapper 1.0.0-dev.77

  • Listened to most of DOM descriptions, and self initiated movement

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Too many alerts

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and too long

Problem:

  1. Users not waiting to listen to whole alert - just

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  1. listening to the first part: "magnet at center of play area"

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  1. Lots of alerts are being fired

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  1. (see #603 during exploration around coil

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  1. @ ~2:00)

Option 1:

  • Text alerts only state proximity relative to coils
  • Remove play area location from text alerts as they are redundant
  • Fire alerts only when thresholds are crossed, not on every stroke / key-up event.

Option 2:

  • Use a grab/release interaction
    • State coil proximity on "grab"
    • State coil proximity change on release.

Aside:

  • The original design was to only fire alerts when certain thresholds were passed, not with every action as it appears to be.
  • (question) We can either attempt to fix this so less alerts, or go with grab/release

  • For #603 at . In the dev version alerts are being fired regardless whether a threshold was transitioned

Coil to the Left / Right alert seems jarring and out of context

Problem:

  • The alerts for "coil to left / right" comes across as jarring and without much context.
  • Example, some confusion for #603 after that alert "4 loop coil to the right" (2:50 - 2:54 Suddenly a different text alert appears “4 loop coil to the right”, but little context. Sudden alert makes it seem exceptional.
    Something with this implementation doesn’t seem right, not sure why it was triggered here and not earlier.)

Fix:

  • Remove this alert. Users seem to manage without it, and get confused with it.

Aside:

  • The original intention of this alert is to help users “set up” their magnet so they know when the coil is to the left or right.
  • (question) Perhaps this alert is not needed (user seemed to have figured it out without the alert anyway).

  • Moving magnet around - AT was reporting only play area location alerts

    • (?JH) There were supposed to be coil proximity information too. Unclear what happened to those.

When sonification and text alert are mismatched

Coil collision and text alert appear mismatched

Problem:

  • When coil is bumped, a "bong" sound is heard, but text alert says: "magnet at center of play area".
  • This creates an incorrect association and explanation.
  • Example: For #603  at 2:25, magnet inside coil and hit the top of coil. "bong" sound heard, but text alert says: "magnet at center of play area".
    • Text alert creating confusion because it's not describing what the "bong" sound means
    • Example
      • 6:26 - #603 wonders why there's a different sound.
      • 6:50 - explanation was given
    • Conversely, the example of the edge bump is good because the text alert explains the sound.
  • Text alerts should prioritize coil proximity first (as mentioned by TS in Github issue comments), then magnet location.

When sonification and text alert are complimentary

Option 1:

  • Remove text alert all together and just have the "bong" sound.

Option 2:

  • When collision occurs, text alert should just say: "bumped a coil".

Aside:

  • Play area edge bump and text alert is an example where this works well: edge bump sound is accompanied by an alert saying the magnet is at the edge

Shorten the Play Area Edge Text Alert

Problem:

  • The play area edge bump text alert is a bit too long.

Option 1:

  • Change: "Magnet at middle-right edge of play area" alert seemed good. User immediately reversed directions (#603)(warning) Simplify this to just say
  • To: "At edge" or "At edge of play area", or remove all together

Option 2:

  • Remove edge bump text alert (edge bump sound may be sufficient).(question) For grab/release interaction, consider adding text alerts for just the exceptional events (coil bump, edge bump).

Aside:

  • Alert seemed good. User immediately reversed directions (#603)

Add coil location to scene summary and circuit description

Problem:

  • Scene summary currently lacks any information to establish the location of the coil in the play area.
  • Motivation: much of the text descriptions and alerts describe magnet and coil, and yet the coil is not mentioned at all in the scene summary.

Fix:

WhatCurrentlyProposed
Scene summary"Faraday's Law‬ is an interactive sim. It changes as you play with it.

The play area has a light bulb circuit, and a moveable bar magnet. There are controls that change what is connected to the circuit, flip the bar magnet, and reset the sim.

Move the magnet to play using arrow keys, W A S D, or 1 2 3 keys.

If needed, check out keyboard shortcuts under Sim Resources."

"Faraday's Law‬ is an interactive sim. It changes as you play with it.

At the centre of the play area is a coil* connected to a light bulb circuit. There is a also moveable bar magnet.

Move the magnet to play using arrow keys, W A S D, or 1 2 3 keys.

Additional controls that change what is connected to the circuit, flip the bar magnet, and reset the sim. If needed, check out keyboard shortcuts under Sim Resources."

*Change "is a coil" to "are two different coils" if both coils are showing.

Circuit PDOM description (1 coil)"In circuit are a light bulb, a 4 loop coil, and a voltmeter. The coil is sideways, with openings on the left and right.""Connected to the circuit are a 4 loop coil, light bulb, and a voltmeter. The coil is at the centre of the play area. The coil is sideways, with openings on the left and right."
Circuit PDOM description (2 coils)"In a circuit are a:
  • Light bulb
  • 4 loop coil
  • 2 loop coil
  • Voltmeter

The coils are sideways, with openings on the left and right."

"Connected to the circuit are a:
  • light bulb
  • 4 loop coil
  • 2 loop coil
  • volt meter

The coils are at the centre of the play area. The coils are sideways, both with openings on the left and right."

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Add "Select magnet" to the instructions for moving it


WhatCurrentlyProposed
Scene summary"Move the magnet to play using arrow keys, W A S D, or 1 2 3 keys.""How to play with the magnet: select magnet; move using arrow keys, W A S D, or 1 2 3 keys."
Magnet PDOM description"Use the W A S D keys to move the magnet in four directions. Use 1 2 3 keys to slide magnet left and right.""How to play with the magnet: Select the magnet; use the W A S D keys to move in four directions; use 1 2 3 keys to slide left and right.