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Observed IssueExample / RemarkGrab and Release Solution

Too many alerts

Every cursor key press and release would fire location text alerts

Location text alert now fired only on release of magnet.

Sonification will now be mostly uninterrupted.

Hard to concentrate on sounds and screen readerUsers often focus on the text alerts and miss the relationship between the magnet movement and the induced charge.

Sonification will now be mostly uninterrupted.

Most text alerts have been removed from movement interaction loop, with the exception of a coil bump and play area edge bump alerts.

Text alerts can be out of sync with the sonificationOften when a sound event happens, like a coil bump or induced charge, text alerts report the magnets location which can create confusion or incorrect associations.

Sonification will no longer compete with most text alerts, thus avoid any confusion.

Coil bumps now have a "Bumped coil" text alert.

Long alerts create cognitive loadA text alert can be very long (regardless of number of coils).

Alerts in general are now shorter and less complicated:

  • Removed play area location alerts.
  • Reduced the complexity of proximity and regions.
Long pauses in alerts causes users to stop listeningScreen readers will pause longer between sentences.Text alerts use less periods (more commas or concatenated phrase fragments).
Coil bump sound can sometimes be ambiguousSome users incorrectly associated the bump coil sound with a goal accomplishment (i.e. paraphrasing "I got the magnet into the coil, and that sound means I made it.").A single text alert now fires when a coil bump occurs ("Bumped coil").
Slide key instructions are often missedMost users did not use the slide keys.Introduce slide key instructions on later magnet grabs (as to not compete with other instructions, and reduce cognitive load).
Not clear to some users how to begin moving the magnetThe magnet button cue wasn't strong, and located in an unintuitive spot in the PDOM.
  • Better label and aria-description for better cueing ("Grab Magnet" and "Select this to move the magnet").
  • Button to grab the magnet is now located in the Controls Area list with other controls.
Unclear what voltmeter doesA number of users did know what the voltmeter was for.

Alternative 1: When voltmeter is visible, a text alert is fired when a peak is reached.

Alternative 2: Include a sentence in the scene summary describing the last voltage peak.

Unclear what sliding does

Sliding keys are now introduced later / scaffolded after the direction keys have been used and when the sliding will actually do something interesting.

See "Text Alerts" below.


EventAlert text

Grab magnet: 1st and 2nd time

"Grabbed" + (magnet location) + ", W A S D keys move in 4 directions. Press Space to release."

*Note: See "Magnet Locations Used for Text Alerts" below

Grab magnet: 3rd time onward

"Grabbed" + (magnet location) + ". Press Space to release."

*See "Magnet Locations Used for Text Alerts" below

Grab magnet: Any time after 2nd grab, and is directly left or right of a coil. Fire this alert at most two times. *

"Grabbed" + (magnet location) + ", try 1 2 3 keys to slide different speeds left and right. Press Shift to stop slide. Press Space to release."*See "Magnet Locations Used for Text Alerts" below

Brightness peaks and falls offSee "Bulb Brightness and Voltmeter Text Alerts" below.
Voltage peaks and falls offSee "Bulb Brightness and Voltmeter Text Alerts" below.
Release magnet

"Released" + (magnet location).

*See "Magnet Locations Used for Text Alerts" below

Bump Coil"Bumped coil"
Bump Edge"At edge of play area."