User-Centred Requirements Handbook |
This section specifies:
• the general characteristics of the software interface of the system, e.g. Windows 95 interface, or monochrome text-based display.
• the hardware interface of the system, e.g. touch screen input with voice output, hands-free telephone, and
• equipment that will be used alongside the system (e.g. hands free telephone, camera for video conferencing, printer, scanner, fax machine, etc.).
A different hardware interface may be provided to support each user group. At the first pass through the process, alternatives should be listed to record all the hardware and methods of interaction that may be used or considered during the design process.
Process
1. Review all the potential user requirements identified in Stages 1 and 2, particularly in Form 1.4 Technical environment, and Form 2.2 Design constraints. Copy those that relate to the software, hardware or other equipment that the user will interact with, into Form 3.4 below.
2. Remove any requirements that duplicate others or do not seem relevant.
3. Add any new requirements which arise from the review of this section.
Form 3.4 - technical Environment requirements (Example)
| 3.4 Technical environment requirements | ||||
| System: Public interface to bank machine | ||||
| Transfer from Form 1.4 Technical environment | Pri. | Ach. | Ref. | |
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Main hardware required System will be based on standard bank machine terminal. - AT&T terminal V1360 Ensure that system keyboard and screen are placed at a standard height. Hardware should be robust . Layout of interface elements and keypad should be consistent with existing conventions and standards. |
Con 2 2 3 |
- *** *** ** |
2.2.1 1.3.6 1.4.1 1.4.2 |
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Software environment Full colour and graphical screens to be built with 'kiosk builder' IBM Public Terminal operating system will be used. |
Con Con |
- - |
1.4.3 |
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Output hardware Screen size will be standard 10 inches, with a resolution of 640x480 Screen should be non reflective |
Con 2 |
- * |
2.2.2 1.9.1 |
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Input hardware Use easy input device: if a keyboard, larger keys, secondary means of identification. Avoid having buttons too small (minimum 2.5 cm square) There will be 8 screen buttons for soft keys, 4 down each side of the display. There will be a keypad of no more than 16 keys. Configuration of keypad is flexible. Colour of keys is flexible. Keys should be operable by users wearing gloves. |
3 3 Con Con Flex Flex 4 |
* - - - - |
1.3.7 1.9.2 2.2.3 2.2.4 2.2.5 |
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Standards to be applied ISO DIS 9241-14 Menu dialogues ISO DIS 9241-7 Display requirements ISO DIS 9241-4 Keyboard |
4 4 4 |
* * ** |
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Communication/network capabilities Ethernet connection to area computer. |
Con | - | ||
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Other equipment Headphones available for visually impaired user to plug in to machine for speech instructions. |
4 | *** | ||
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Other characteristics System response times should be <2 seconds, and never more than 10 seconds. Card should give clear step-by-step instructions for main transactions which can be followed when using the machine. |
3 2 |
* ** |
1.4.6 |
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