Abstract
Three-way decision is about thinking, problem-solving, and computing in threes or through triads. By dividing a whole into three parts, by focusing on only three things, or by considering three basic ingredients, we may build a theory, a model, or a method that is simple-to-understand, easy-to-remember, and practical-to-use. This philosophy and practice of triadic thinking appears everywhere. In particular, there are a number of three-world or tri-world models in different fields and disciplines, where a complex system, a complicated issue, or an intricate concept is explained and understood in terms of three interrelated worlds, with each world enclosing a group of elements or representing a particular view. The main objective of this paper is to review and re-interpret various three-world conceptions through the lens of three-way decision. Three-world conceptions offer more insights into three-way decision with new viewpoints, methods, and modes. They can be used to construct easy-to-understand explanations in explainable artificial intelligence (XAI).
Y. Yao : I would like to express my thanks to Professor Duoqian Miao and Professor JingTao Yao for organizing the IRSS President’s forum and for encouraging me to write this paper. I am grateful to the reviewers for their encouraging and constructive comments. This work was partially supported by a Discovery Grant from NSERC, Canada.
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Notes
- 1.
The two types presented here are related to the distinction, suggested by Achinstein [1], of an “explaining act” and an explanation as a “product” of an explaining act. Ruben [23] made a similar distinction through “process and product.” The first type is more about an explanation itself. The second type relies on an understanding of an “explaining act” that includes both the formulation and the communication of an explanation.
- 2.
This example will be further examined in the later part of the paper. For an actual application, we may point at the earlier expert system MYCIN that uses the What-Why-How triad, in which an explanation subsystem focuses mainly on Why and How questions to justify the decision of the system or to educate the user [32]. The triad is equally useful for enhancing human intelligence and guiding human behavior [46]. For example, the Golden Circle leadership model, introduced by Sinek [29], is based on the Why-How-What triad, which advises that every organization and everyone of us should know the three most important things: why we do (i.e., purpose and goals), how we do, and what we do. The same Why-How-What triad was used by Clear [6] in his three-level model of behavior change, focusing on what we believes, what we do, and what we get.
- 3.
https://sloanreview.mit.edu/audio-series/three-big-points/, accessed May 20, 2022.
- 4.
https://www.nature.com/articles/d41586-019-01362-9, accessed May 20, 2022.
- 5.
As an example, we may take a look at the many different interpretations and explanations of a Chinese classic, “I Ching” (The Book of Changes). “I Ching” has shaped every aspects of Chinese ways of seeing, knowing, and living (for example, culture, art, politics, science, etc.) throughout the Chinese history. Many scholars have interpreted and explained, and are continually searching for new interpretations and explanations, this classic text from many different angles. The notion of SMV space may shed a new light by organizing some of the existing interpretations and explanations at the three levels: (1) images and numbers at the S (Symbols) level, (2) meaning and principles at the M (Meaning) level, and (3) living and practice, according to its meaning and principles, at the V (Value) level. Although this organization may not be hundred percent appropriate or accurate, it does provide a good enough approximation in terms of the text itself, the meaning of the text, and the value of the text.
- 6.
A few important issues regarding AI and human-machine relations are relevant to the discussion here, such as alignment and control. Christian [5] argued that artificial intelligence systems, in particular machine learning, need to be aligned with human values. Russell [24] pointed out that advances in AI may pose a potential risk to the human race by out of control superhuman AI. Future AI research must ensure that machines remain beneficial to humans and we humans must retain “absolute power over machines that are more powerful than us.” By living together in the three worlds of SMV, namely, symbols/data, meaning/knowledge, value/wisdom, humans and machines may coexist in harmony.
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Yao, Y. (2022). Three-way Decision, Three-World Conception, and Explainable AI. In: Yao, J., Fujita, H., Yue, X., Miao, D., Grzymala-Busse, J., Li, F. (eds) Rough Sets. IJCRS 2022. Lecture Notes in Computer Science(), vol 13633. Springer, Cham. https://doi.org/10.1007/978-3-031-21244-4_4
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