ISO/IEC 7818:2025

Information technology - User interfaces - Framework of voice user interfaces for personal mobility services

This document provides a framework of voice user interfaces (VUI) for personal mobility services (PMS). The users of PMS ride personal mobility devices (PMD), which are empowered by electricity or a human, and interact with the PMS through the VUI (see Annex A) attached to the PMD. This document describes the functional requirements, the performance requirements and the procedure of the VUI. This document is applicable to a VUI attached to a PMD, which can be used for interaction between users and the PMD.

Technologies de l'information — Interfaces utilisateur — Cadre pour les interfaces utilisateur vocales pour les services dans le domaine de la mobilité personnelle

General Information

• Status: Published
• Publication Date: 24-Sep-2025
• ICS: 35.240.20 - IT applications in office work
• Technical Committee: ISO/IEC JTC 1/SC 35 - User interfaces
• Drafting Committee: ISO/IEC JTC 1/SC 35 - User interfaces
• Current Stage: 6060 - International Standard published
• Start Date: 25-Sep-2025
• Due Date: 14-Sep-2025
• Completion Date: 25-Sep-2025

Overview

ISO/IEC 7818:2025 - Information technology - User interfaces - Framework of voice user interfaces for personal mobility services - provides a standardized framework for voice user interfaces (VUI) attached to personal mobility devices (PMD). The standard defines the functional and performance requirements and the interaction procedure for VUIs used by riders of PMDs (e.g., e-bikes, e-scooters, e-kickboards). It applies to VUIs that enable interaction between users and PMD-based personal mobility services (PMS) such as navigation, guidance, environment info and system status.

Key topics and technical requirements

• Scope and definitions: Clarifies PMD (single-user, typically <25 km/h) and PM services (navigation, traffic, weather, battery/status, emergency).
• VUI interaction procedure: Stepwise process from speech acquisition → automatic speech recognition (ASR) → optional natural language understanding (NLU) → PM service execution → feedback generation → user output (TTS or display).
• Voice command design:
  • Attributes for each command (title, function, phrase) and defined start/end signals.
  • Command types: starting, terminating, selecting function, and control commands (volume, scroll, back/next).
  • Guidance outputs: confirmations, periodic updates, and turn-by-turn guidance.
• Functional requirements for VUI:
  • Speech acquisition (microphone/array; see ISO/IEC 24661 references).
  • ASR capability to convert speech to text reliably.
  • PM service execution: inference, search, routing and decision-making to fulfil user requests.
  • Feedback reporting: audio and visual presentation (TTS, screen) with real-time considerations for location-based services.
• Safety constraints: Voice commands shall be used only for non-safety-critical functions (e.g., navigation, audio). Functions affecting braking, acceleration, lights are excluded. Mode changes that affect maximum speed must only occur when parked and with confirmation.
• Normative references: ISO/IEC 30122-1 (voice commands framework) and microphone guidance (ISO/IEC 24661).

Applications and who uses this standard

ISO/IEC 7818:2025 is intended for:

• PMD manufacturers integrating on-device or accessory VUIs for e-bikes, e-scooters, and similar devices.
• VUI and ASR/NLU engineers designing voice systems optimized for outdoor, moving users.
• Mobility service providers and app developers delivering navigation, routing, traffic, and system-status services.
• City planners and fleet operators deploying shared micro-mobility services.
• Accessibility and HCI professionals seeking consistent, hands-free interfaces for riders.
• Regulators and certification bodies evaluating safety and usability of voice-enabled PM services.

Practical use cases include hands-free route guidance, real-time traffic/weather alerts, battery and system status reporting, and context-aware periodic updates-improving safety and convenience for urban commuters.

Related standards

• ISO/IEC 30122-1 - Voice commands: framework and general guidance
• ISO/IEC 24661 - Microphone & microphone array guidance (referenced for speech acquisition)

Keywords: ISO/IEC 7818:2025, voice user interface, VUI, personal mobility services, PMD, ASR, NLU, TTS, e-bike, e-scooter, PM service.

Standards Content (Sample)

International
Standard
ISO/IEC 7818
First edition
Information technology — User
2025-09
interfaces — Framework of voice
user interfaces for personal
mobility services
Technologies de l'information — Interfaces utilisateur — Cadre
pour les interfaces utilisateur vocales pour les services dans le
domaine de la mobilité personnelle
Reference number
© ISO/IEC 2025
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Published in Switzerland
© ISO/IEC 2025 – All rights reserved
ii
Contents Page
Foreword .iv
Introduction .v
1 Scope . 1
2 Normative references . 1
3 Terms and definitions . 1
4 Personal mobility service. 2
5 Framework for voice user interface for personal mobility service . 3
5.1 General .3
5.2 Procedure of interacting with VUI .3
6 Requirements . 4
6.1 Requirements of voice commands for personal mobility service .4
6.2 Requirements of voice user interface for personal mobility service .5
7 Recommendations . 5
7.1 Recommendations for voice user interface .5
7.2 Recommendations for personal mobility service .6
Annex A (informative) Examples of VUI for PM service . 7
Bibliography . 8

© ISO/IEC 2025 – All rights reserved
iii
Foreword
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© ISO/IEC 2025 – All rights reserved
iv
Introduction
Personal mobility (PM) devices such as e-bikes, e-scooters and e-kickboards are becoming popular. A PM
device is operated by a single driver at a low speed (i.e. less than 25 km/h). It is mainly used to transport
short-distance commuters in cities. It is regarded as a part of environmentally friendly and integrated
transportation systems in the cities.
Many PM services such as navigation and guidance are provided to the PM device users in the cities. The PM
service can be used to support safety and convenience of the users during their driving PM devices. The PM
services can provide information of traffic, parking, environment, tourism, etc.
The users can safely control and interact with the PM services through voice user interfaces (VUI). Since the
users drive their PM devices using their hands, the VUI can be used to assure their safe driving. It follows
that voice commands are main tools to communicate with the PM services while the users are driving their
PM devices.
© ISO/IEC 2025 – All rights reserved
v
International Standard ISO/IEC 7818:2025(en)
Information technology — User interfaces — Framework of
voice user interfaces for personal mobility services
1 Scope
This document provides a framework of voice user interfaces (VUI) for personal mobility services (PMS).
The users of PMS ride personal mobility devices (PMD), which are empowered by electricity or a human, and
interact with the PMS through the VUI (see Annex A) attached to the PMD.
This document describes the functional requirements, the performance requirements and the procedure of
the VUI. This document is applicable to a VUI attached to a PMD, which can be used for interaction between
users and the PMD.
2 Normative references
The following document is referred to in the text in such a way that some or all of their content constitutes
requirements of this document. For dated references, only the edition cited applies. For undated references,
the latest edition of the referenced document (including any amendments) applies.
ISO/IEC 30122-1, Information technology — User interfaces — Voice commands — Part 1: Framework and
general guidance
3 Terms and definitions
For the purposes of this document, the following terms and definitions apply.
ISO and IEC maintain terminology databases for use in standardization at the following addresses:
— ISO Online browsing platform: available at https:// www .iso .org/ obp
— IEC Electropedia: available at https:// www .electropedia .org/
3.1
voice command
spoken instruction to control ICT system
[SOURCE: ISO/IEC 30122-1:2016, 4.1]
3.2
voice operation
function that allows users to operate a computer with voice commands (3.1)
Note 1 to entry: The voice commands usually follow an activation keyword (e.g. “Computer!”) to distinguish them
from other speech that is not intended as a voice command.
[SOURCE: ISO/IEC 20071-5:2022, 3.31, modified — Example and Note 2 to entry removed.]

© ISO/IEC 2025 – All rights reserved
3.3
voice user interface
VUI
user interface that recognizes voice commands (3.1) from users and presents the results of executing the
commands to the users
Note 1 to entry: The voice used interface recognizes the voice commands and outputs the results of the corresponding
voice operations (3.2).
3.4
personal mobility device
PM device
personal transporter that provides mobility to people and is empowered by electricity or a human
EXAMPLE Bicycle, e-bike, e-kickboard, etc.
Note 1 to entry: PM device is designed for use by a single person and normally driven at low speeds less than 25 km/h.
Note 2 to entry: PM device does not include automobiles and motorcycles.
Note 3 to entry: PM device can be used by people without any type of driver’s licenses.
Note 4 to entry: PM device can support everyday activities of people who are partially or completely immobile and can
be operated on pedestrian ways.
3.5
personal mobility service
PM service
service for the personal mobility device (3.4) users
EXAMPLE Navigation to find a way to destination; guidance to provide information of road, traffic and weather;
system status to report speed, time and distance, etc.
4 Personal mobility service
A personal mobility (PM) device is a compact personal transporter such as an e-bike or e-kickboard. It is
used in urban environments as a mode of transportation for commuting, shopping, delivering, sightseeing,
recreating, etc.
PM device users are mostly connected to communication networks through their smart phones or ICT
devices attached to the PM device. Va
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