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Standards Development
This document specifies requirements for the design, verification, and validation measures to achieve the AAL-specific safety of the intended functionality (SOTIF) for electrical/electronic E/E systems in which housing equipment with advanced features operates in cooperation to improve the lives of AAL users effectively. SOTIF refers to the absence of unreasonable risk due to hazards resulting from malfunctioning behaviour, that are caused by unexpected factors in the designer’s intended function or reasonably foreseeable misuse, in E/E systems in which housing equipment that has been made in accordance with the design intention operates in cooperation.
The E/E system in which housing equipment operates in cooperation covered in this document is a system that is a combination of existing products from different companies as well as newly developed products. E/E systems in which housing equipment operates in cooperation tend to mislead users and are likely to be used incorrectly because their combinations may change according to the lifestyle of the user and there are differences in the performance, conflicts in purpose or operation as well as differences in functionality among individual products with respect to the whole system. This document is meant to be applied to the intended functionality of E/E systems in which housing equipment operates in cooperation.
This document covers the intended use and the reasonably foreseeable misuse in the operation phase, considering the diversity of AAL users who have difficulty in understanding the intent of the E/E system accurately.
Advanced E/E systems installed in houses are effective means to improve the lives of AAL users. With the increasing functionality and complexity of home equipment cooperation in IoT homes that rely on control by E/E systems, countermeasures against safety risks associated with the cooperative systems become an important issue. The advanced functions of life support systems for AAL users are built not only with equipment provided by individual housing equipment manufacturers, but also with newly developed equipment that can be connected to the products and functions of various manufacturers.
IEC 63168 series specifies requirements for addressing unreasonable risks due to failures of cooperative E/E systems consisting of home equipment installed in IoT houses. However, in order to keep the safety of a cooperative E/E system consisting of home equipment in IoT houses at an acceptable level, it is also necessary to take measures on the unreasonable risk of hazards due to the intended function and its implementation. Unreasonable risk of the intended function refers to the risk caused, not by failures, but by the design limitations and reasonably foreseeable misuse of the E/E system.
In particular, a system in which products of different manufacturers cooperate with each other is likely to give users inadvertent misunderstandings due to differences in performance and functions between products, and thus unreasonable risks due to misuse may occur even if no failure occurs in the E/E system. In addition, since the system may be modified to suit the lifestyle of AAL users over time, activities need to be undertaken to eliminate unreasonable risks caused by design limitations and lack of awareness of the situation as well as reasonably foreseeable misuses, depending on the time and situation.
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