| This dissertation research aims to provide a better understanding of people's credibility assessment of online information (i.e., Web credibility assessment), which is an important part of their information behavior. In particular, this research focuses on older adults as a research population as they are a less studied user group in the literature on information credibility. Considering the ever increasing presence of older adults on the Web and their needs for health information in their daily lives, this research explores older adults' credibility assessment of online health information within the context of everyday life information seeking (ELIS).;The methodology employed in this research consists of a qualitative meta-study (Phase I) and semi-structured interviews (Phase II). In Phase I, the researcher analyzed 84 primary research reports on information credibility, identifying conceptual typologies of important facets of credibility assessment such as conceptualization, operationalization, variability (user characteristics and contexts), and process. Based on these conceptual typologies, the researcher proposed a new, extended framework of Web credibility assessment, named WC framework, that contains three main components, Assessment of WC---i.e., conceptualization and operationalization to measure Web credibility; Variability of WC---i.e., variables regarding individual and context; and Process of WC---i.e., the overall process of Web credibility assessment.;In Phase II, the researcher conducted semi-structured interviews with twenty-one older adults whose ages ranged from 61 to 80 (M = 70.3) in the manner of one-on-one, in-person. The purposeful sampling methods, such as convenience sampling and snowball sampling, were used to recruit older adults who meet the sampling criteria of the study: age (55 years old or older), residency (Florida residents for an in-person interview), and Internet use experience. Also, a prescreen test was carried out via a telephone interview to make sure that the participant's cognitive function was adequate for the study. Those who met all the sampling criteria and passed the prescreen test were recruited for an in-person interview which lasted around 45 minutes.;The interview data revealed that older adults needed health/wellness information regarding medication and supplements, symptoms of and cures for specific diseases, medical quality assurance, health insurance, nutrition, and exercise. In seeking health information, they used both interpersonal and online sources. As for the interpersonal sources, the research participants mentioned medical professionals (e.g., doctors and physicians), partners, family, and friends. On the Web, they referenced information from non-profit (i.e., non-commercial) institutions' websites such as government websites (e.g., NIH, CDC) and university hospitals' websites (e.g., Johns Hopkins Medicine, Harvard Medical School). The most frequently mentioned commercial website was WebMD. Depending on the purposes of health information seeking, some interviewees mentioned that they used pharmacists' websites (e.g., Walgreens and CVS).;When judging the credibility of online health information, they employed various cues/markers and heuristics that are related to the attributes of the operator (i.e., source), content (i.e., message), and design (i.e., media) of Web resources. Based on the new framework developed in Phase I, the informants' Web credibility assessment process was characterized with the two stages: initial and final evaluations.;Lastly, both theoretical and empirical implications of the research and future research directions were discussed. Specifically, the new Web credibility assessment framework (i.e., the WC framework) advanced our understanding of the conceptualization of Web credibility and can be used as a knowledge resource in developing context specific credibility assessment models as well as information system interfaces that provide effective support for information credibility evaluation by users. Likewise, findings from the semi-structured interviews can inform online information system developers and librarians about how older users search for online health information and how they assess its credibility. Ultimately, the findings of this research should help the development of more effective online systems, services, and, training modules that are aligned with the online information behaviors of this rapidly growing, important user population---i.e., older adults. |
