Old Design Notes
360 rotation of the arm
- could be confusing to a non-visual user since there is no beginning or end
- perhaps we can limit the rotation (i.e. 270 degrees)
Audio feedback for location of arm
- approach 1: have the door-knob act as a landmark and have the rotation described or sonified as a distance from the door knob.
- Example hand approaching and going away from:
- "Hand is moving closer to the door knob." / "Hand is moving away from the door knob."
- If sonified using pings, the pattern may look be like this: ". . . . . . . ..... . . . . . . . ."
- disadvantage: this implies some importance to the door knob. May preclude any other discoveries like the effect of distance.
- it's okay to describe the proximity of the door knob.
- approach 2: use some sort of scale (degrees, or clock face) to indicate arm rotation.
- disadvantage: this is cognitively harder to understand and introduces a scale which the learner may not be familiar with.
- Arrow keys with accelerator, spatial description relative to the door knob.
Keyboard Tab Order - Leg or Arm first?
Arm is first
- The user may spend time moving the arm without an effect. This may actually be desirable as it could reinforce the learning outcome.
- However, if the arm is first, a user of a screen reader may take longer to figure out what is (not) happening because of the serial nature of the feedback.
- During an informal observation of a sighted user, they spent a while moving the arm around wondering if they did something wrong. They were almost going to give up until they tried the leg. For a non-sighted user, this process of discovery will take much longer.
- The user experiences a more immediate result if starting with the leg first.
- The current default arm position will cause a discharge of electrons if enough electrons are gathered. Is this intentional?
- PhET design - your start begins with something that does something. Therefore start with the leg.
- explore use of accelerator key (CTRL + Left / Right).
- describe leg position relative to contact with the carpet.
Visual and Audio Prompts
- Does using arrows and text descriptions to indicate directions of movement give away too much of the interaction? Is this acceptable?