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Table 11.2    Partial Chart of Task Analysis from an Antecedent Product (Basic Cellular Telephone)
Task Analysis Function Associated Element Location of Use*User Priority/Freq. 1 cs. 2 Hands Video Ref. No.
Incoming call/message
Call alert Display: Calling Line identification and associated softkeys (Tone if call waiting) H E S High — 2
Adjust ringer volume during alert Mode switch OR Volume switch H S Med. 1 —
Answer call Talk, flap, ANS softkey (or LINK softkey if call waiting) H E S High 1 2
Dispose of call (send to Voice Mail, forward to another number, …) Associated softkey (SEND, FWD, …) H S Med. 2 2
Note alert Display: message and associated softkeys H E S High — 3
On a call
Initiate network features (ex. 3-way Calling) LINK softkey or feature-programmed softkey H E S Low 2 2
Terminate calls and exit the user from any task End H E S High 1 2
Enter extra numbers (IVR systems) Dialpad H S Med. 1 —
Switch to headset Headset jack H E S Low 2 —
Switch to handsfree Handsfree H E S Low 1 —
Adjust speaker volume Volume switch H E S Med. 1 —
Mute the call Mute H E S Med. 1 —
Dial out Directory items while offhook TBD H S Med. 1 —
Using radio link (general)
Out of range warning Display and tone H E S High — —
Battery Low warning Display and tone H E S High — —
Initiating a call
Dial a call (active deal or predial) Dialpad [harr] Talk, flap, DIAL softkey H S High 1 —
Dial from Directory Directory [rarr] scroll keys or dialpad [rarr] Talk, flap, DIAL softkey H S High 1 1
Dial back a Caller from the Messages List Messages [rarr] scroll keys [rarr] REPLY softkey H S High 1 5
Redial a number Redial Æ Talk, flap, DIAL softkey H S High 1 —
*Note: User may be interacting with the device with or without a headset.

Location of Use: H = hand E = ear S = surface.

Video Reference: 1 = Make a call, 2 = Receive 2 calls, 3 = Receive a note, 4 = Change mode, 5 = Retrieving messages, 6 = adding to Directory.

Users were videotaped conducting typical tasks. These numbers refer to location markers on the videotape.


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