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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

now be mostly uninterrupted

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

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

Long alerts create cognitive loadWhen 2 coils are present, a text alert can be very long.

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.
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 magnetOne user kept searching the Controls Area.The 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.

Issues not yet addressed:

Observed IssueExample / RemarkNotes
Unclear what sliding doesWhen sliding occurs, the sim can be rather silent.
  • Is this a concern? Users may not have used it sufficiently to determine its usefulness.gain clarity
  • Are there magnet movement sounds when sliding occurs? (i.e. movement ticks).
Unclear what voltmeter doesA number of users did know what the voltmeter was for.
  • Is this a concern? Most users will use FL in context of a learning unit.
  • The voltmeter could be defined in the description instead (i.e. "Voltmeter - measures the positive / negative charge flowing through the circuit.")
  • The voltmeter is initially available - AP suggested it should be hidden by default
Unclear about use of field linesTurning on field lines has no immediate perceivable effect.
  • Currently the design only updates the "Magnetic Field Lines" description as the magnet moves.
  • Should the field strength be added to the text alert when magnet is released?

PDOM Example

Faraday's Law (h2, Scene Summary)