• Dr. Toralima Bora
• Dr. Manash Pratim Barman
• Dr. Jutimala Bora
• Karuna Gogoi

Uncertainty arises due to partial information about the problem or due to information which is not fully reliable. But the apparatus of probability theory cannot cover all kinds of vagueness; therefore the necessity of new approach was obvious. To fill up this gap a new approach has been developed. Fuzzy logic deals with reasoning that is approximate rather than fixed and exact. The term “fuzzy logic” was introduced in conjunction with the proposal of fuzzy set theory by Lotfi A. Zadeh in the year 1965.Fuzzy logic has been applied to many fields. In this paper we have made an attempt to use the fuzzy approach to measure the quality of life. Fuzzy set theory can improve various aspects of measurement with questionnaires. However, very little is known about how to use Fuzzy approach to measure quality of life(QOL). The main purpose of our study was to find an appropriate fuzzy measure for Quality of life(QOL) that, while demonstrating the advantages of Fuzzy approach, can also be compared with mainstream Quality of life measures, most of which use traditional Likert-type scales. Methods: Referring to the literature on fuzzy scoring methods, at first the measurement scale and scoring method of the traditional Older People’s Quality of Life Questionnaire (OPQOL) which uses a five-point Likert-type scale are revised. Then, the psychometric relationships of the fuzzy measures and the traditional OPQOL are examined. Results and conclusion: The results show that a fuzzy-scales weighted-by-membership (FSWM) version of the OPQOL is comparable to the traditional OPQOL in that it accepts strong invariance and shows almost perfect agreement. It also demonstrates higher reliability and validity than the traditional OPQOL. From the results of the study the use of FSWM to measure QOL in future studies is recommended.

Fuzzy Approach, Likert-type scales ,Quality of life, Older People’s Quality of Life Questionnaire etc.

" “Measuring Quality of Life of Elderly People: A Fuzzy Approach”", International Journal of Emerging Technologies and Innovative Research (www.jetir.org), ISSN:2349-5162, Vol.9, Issue 3, page no.c497-c507, March-2022, Available :http://www.jetir.org/papers/JETIR2203266.pdf

" “Measuring Quality of Life of Elderly People: A Fuzzy Approach”", International Journal of Emerging Technologies and Innovative Research (www.jetir.org | UGC and issn Approved), ISSN:2349-5162, Vol.9, Issue 3, page no. ppc497-c507, March-2022, Available at : http://www.jetir.org/papers/JETIR2203266.pdf