Search Handbook Cards

Voice and head-worn displays are primary alternatives

Users apply the model of one interaction style to a product in a different modality

What makes speech intelligible is how far it rises above the background, not the noise level alone

A noisy room garbles what a device says and what its microphone hears, both at once

Combined PPE effects require integrated rather than item-by-item testing

A normal audiogram with difficulty understanding speech in noise is an easily overlooked hearing impairment

Vision and hearing are separate perceptual resources; speech and manual response are separate response resources

Two tasks drawing on the same resource interfere the most

Estimate by summing time constants for standard operator units

Law lags new interaction forms, leaving them in a grey zone

Distributed interaction needs consistent entry points to stay manageable

Touch, voice, and gesture lack agreed-upon constants and must be measured before use

Touchless interaction reduces contact transmission and queuing costs

Voice quality shapes listeners' subjective judgment of content credibility

Hands-free solutions must work in noise

Mobile and desktop AT interaction models differ

Blocking takes effect client-side instantly, not after review

Both hands are often occupied during field work

Face-to-face, video, voice, and text progressively offer fewer cues

Voice and gesture recognition degrade in noisy public settings

Inconsistent anthropomorphism within a product line confuses users

Gloves, noise, and vibration constrain input methods

Interaction capability spreads across many devices instead of one place

People respond automatically to pseudo-social cues from machines

Multi-display cabins must tell who is using which screen

A default female voice binds the assistant role to gender

Noise and multiple passengers degrade in-car voice

Comparison and browsing tasks are a poor fit for voice

Voice earns its keep when hands and eyes are already taken

Anthropomorphism should match the social interaction required by the task

Eyes-free needs its own design, not a degraded GUI

Screen reader and browser combinations do not behave alike

Voice can remain more usable than touch under protective equipment

Give an interface a name or a voice and people expect it to act like a person

Signal-to-noise ratio directly determines whether recognition is usable

Cover mainstream combinations, not a single environment

Private and public places tolerate different behaviour; the same function must be designed per setting

Accuracy gaps exclude particular populations

Lockouts should follow distraction risk, not feature category

Users form a one-sided bond with a character, and taking it away later costs trust

This ability declines with age and hearing loss

Small nonrandom groups cannot estimate population proportions

Interrupting costs more socially in remote channels

Avoid default assumptions about ability, gender, or age

Rear-seat interaction must not leak into the driver’s task

Oversized social structures weaken actual belonging

Rich channels cost more

Anthropomorphic form evokes social expectations

Workshop outputs are clues to needs, not validated designs

The center stack carries navigation, media, and other secondary work