Sheizaf Rafaeli

Sheizaf Rafaeli
University of Haifa | haifa · Internet Lab

MA Ph.D Dr. Professor

About

140
Publications
67,472
Reads
How we measure 'reads'
A 'read' is counted each time someone views a publication summary (such as the title, abstract, and list of authors), clicks on a figure, or views or downloads the full-text. Learn more
6,728
Citations
Citations since 2016
31 Research Items
2505 Citations
20162017201820192020202120220100200300400
20162017201820192020202120220100200300400
20162017201820192020202120220100200300400
20162017201820192020202120220100200300400
Additional affiliations
October 1998 - present
University of Haifa
Position
  • Managing Director
August 1985 - August 1998
Hebrew University of Jerusalem
Position
  • Head, Information Systems Area

Publications

Publications (140)
Article
Full-text available
Data journalism (DJ) fosters audience independence. It encourages content exploration through visualizations, storytelling, and direct access to data sources. DJ assists the audience to be well informed, cognitively active, and contribute to the public sphere. Achieving this objective indicates the audience's independence. How independent is the au...
Article
Full-text available
With the growing role of online multi-participant collaborations in shaping the academic, professional, and civic spheres, incorporating collaborative online practices in educational settings has become imperative. As more educators include such practices in their curricula, they are faced with new challenges. Assessment of collaborations, especial...
Conference Paper
Full-text available
Creativity derives from the ability to form new meaningful combinations out of available resources. Collective creativity is the product of a collaborative process, consisting of multiple interactions between group members and the shared content, which lead to the emergence of novel shared meanings. This exploratory research addresses the expressio...
Conference Paper
Full-text available
How can linking content units by participants affect knowledge construction in online multi-participant communication? Analysis of data from seven online discussions suggests that linking can be used by participants as a means of organizing shared knowledge into small-world structures that are efficient and easy to navigate while preserving complex...
Conference Paper
Full-text available
1 Abstract The study examines the interaction between crowds (the users) and task (knowledge pooling) through gamification. By probing the sensitivity of three types of crowd to various scores mechanism designs, we aim to highlight the nuance between quantity and quality of knowledge contribution. Results support the importance of choosing the righ...
Conference Paper
Full-text available
Learning in a networked society is presented in this symposium with the basic assumption that “schooling” and “society” cannot be considered as separate entities and should bring together the theoretical and practical tools of scientists in both the social and educational sciences. Despite the powerful potential for cross-fostering of ideas between...
Chapter
Online social learning is a prevalent pedagogical tool, enabling learners across all ages and cultures to learn together. Educators, policy-makers, and international organizations such as the Organization for Economic Cooperation and Development (OECD) stress the need to assess collaborative learning systematically. However, the systematic assessme...
Conference Paper
Full-text available
The Internet and social media have rapidly changed our lives, and are profoundly affecting the social lives of adolescents, expanding and enriching their communication options. At the same time, they often operate as a platform that amplifies the real-world phenomenon of interpersonal rejection-a harsh and excruciating experience. In this study, we...
Article
Full-text available
Composite indicators (CIs) are common measurements and benchmarking tools used to measure multidimensional concepts such as well-being, education and more. Indicators and sub-indicators are selected and combined to reflect a measured phenomenon. Measurement iterations produce a series of time-oriented data, which stakeholders, as well as the genera...
Article
Full-text available
Background:. The use of social media is growing tremendously along with its impact on the practice of plastic surgery, for better or for worse. Patients are increasingly using social media to obtain information about either the procedure or the surgeon. Objectives:. The aims of this study were to examine social media posting regarding plastic surge...
Conference Paper
Full-text available
The current study investigates how the game points allocation function affects quality of responses and replaying behavior in a game-for-crowds implementation. In a series of experiments, we compare between two scoring designs across two types of users: students and public. Two reward-based mechanisms differing in the mathematical function were app...
Article
Badges are a common gamification mechanism used by many crowd-sourced online systems. This study provides evidence to their effectiveness and measures their effect size using a big data natural experiment in three large Stack Exchange online Q&A sites. We analyze the introduction of 22 different badge-launch events and the resulting changes in user...
Conference Paper
Full-text available
Composite Indicators (CIs), are a common measurement and benchmarking tool that are used to reflect and measure multidimensional concepts such as digital divides, individual's well-being and more. Measurement iterations produce a series of time-oriented data, which stakeholders as well as the general public might be interested to interpret. Visuali...
Article
This study explores the phenomenon of multiactivity during recreational video-mediated communication (VMC) through the analysis of competing engagements. From a data corpus of naturally occurring interactions in public Google Hangouts, we focus on instances of competing engagements triggered by the co-presence of unratified participants in broadcas...
Article
Drawing on literature on interaction and participation in computer-mediated communication (CMC) and video-mediated communication (VMC), this study explores cross-modal exchanges with regards to participation in public video chats. By cross-modal, we wish to characterize interactions in which the production modality is different from the interlocuto...
Article
The increased use of online discussions in learning environments both formal and informal, positions the construct of interactivity as central to learning. Interactivity in learning communities' online discourse is viewed in this study as a socio-constructivist process. It is the network of interactions among content items and participants which dr...
Article
Full-text available
A composite indicator (CI) is a measuring and benchmark tool used to capture multi-dimensional concepts, such as Information and Communication Technology (ICT) usage. Individual indicators are selected and combined to reflect a phenomena being measured. Visualization of a composite indicator is recommended as a tool to enable interested stakeholder...
Article
Full-text available
Online discussion is an essential tool for the collaborative construction of knowledge in learning communities. LMSs (Learning Management Systems) include such collaborative tools to enable knowledge sharing. Common topology and design constructs of online collaboration are often expressed as forum threads; however, forums or bulletin boards are no...
Chapter
Full-text available
Gamification is the use of game design elements in non-game contexts to encourage a desired type of behavior. In recent years gamification systems have been applied in marketing as well as non-business contexts such as politics, health, or interactive systems and education. Although gamification is a new concept, it is gaining momentum; technology...
Conference Paper
Full-text available
This symposium brings together the theoretical and practical tools of scientists in both the social and educational sciences in order to examine the types of interaction, knowledge construction, social organization and power structures that: (a) occur spontaneously in technology-enhanced learning communities or (b) can be created by design. We refe...
Article
One of the methodological and logistic problems of network research is the challenge of big data. Dynamics and network qualities are not as easy to extrapolate as averages and distributions. The numbers are huge, and traditional sampling doesn’t solve the problem. What if, by using a small sub–group of the members of a population, we could understa...
Article
Full-text available
One of the methodological and logistic problems of network research is the challenge of big data. Dynamics and network qualities are not as easy to extrapolate as averages and distributions. The numbers are huge, and traditional sampling doesn’t solve the problem. What if, by using a small sub–group of the members of a population, we could understa...
Article
Full-text available
Day-to-day information needed by citizens can be sought in a variety of ways. Specifically, we were interested in users of online, citizen rights websites, such as the SHIL site (http://shil.info). Our results report findings from three parallel data collection efforts. Surveys were undertaken to gain a better understanding of how the SHIL website...
Conference Paper
Full-text available
Gamification, the use of game design elements in non-game contexts to encourage a desired type of behavior, have become increasingly popular over the last few years. Gamification attempts to harness the motivational power of games, however existing motivational models for video game play focus on how a game as a whole creates experiences of fun and...
Chapter
Full-text available
Access the chapter on Google books: http://books.google.co.il/books?id=kBIb2l64qtAC&lpg=PA21&dq=Netified%3A%20social%20cognition%20in%20crowds%20and%20clouds&pg=PA21#v=onepage&q=Netified:%20social%20cognition%20in%20crowds%20and%20clouds&f=false
Article
Full-text available
The widespread penetration of smart mobile devices has facilitated rapid growth of mobile location-based services (LBS), which provide users with a variety of benefits and are attractive from a marketing perspective. However, mobile-payment (M-Payment) adoption by users has been below expectations. For better understanding of drivers and inhibitors...
Article
Purpose Citizens Advice Bureau (SHIL in Hebrew) is an information and referral service dedicated to serving the needs of citizens by providing easy access to information about citizenship rights and obligations. Many people turn to the offices of SHIL either for help or to volunteer as advisors. This study seeks to examine the information seeking b...
Conference Paper
This study defines and explores relations between knowledge-seeking and social relationship networks, using data from a popular Q&A social network site. Our theoretical framework draws on Motivation, Common-goods, and Social capital theories to generate an understanding of the interrelationship of the two types of networks. A dataset consisting of...
Article
Full-text available
Interactivity is not unique to computers or networks and cannot be reserved solely for the discussion of so-called 'New Media'. Restricting analysis of interactivity to the domain of computerized and new technology alone problematizes comparisons with traditional media as well as with further developments of the new media. This article begins by re...
Article
In this paper we report the results of an offline survey of the information needs of members of the Israeli public about public and governmental services and entitlements. This survey was conducted as part of a research project on public use of online information: usage analysis of the Israeli Citizens Advice Bureau (SHIL) on the Web. The questionn...
Article
Full-text available
The large-scale adoption of computer mediated communication technologies has resulted in what has been described as “mass interaction”, shared discourse between hundreds, thousands or more individuals. The emergence of mass interaction presents new opportunities to learn about and understand human communication, and information technologies. A numb...
Conference Paper
This study investigates two questions concerning question-and-answer sites. We analyzed data from "Yahoo!Answers", including 19 months and over 20 million interactions per month. The first question investigates the differences in response time and in the average number of answers between anasker's ranking of "Best Answer" (BA) and the community's B...
Article
Prediction Markets are a family of Internet–based social computing applications, which use market price to aggregate and reveal information and opinion from dispersed audiences. The considerable complexity of these markets inhibited the full realization of the promise so far. This paper offers the P–MART classification as a tool for organizing the...
Article
This study examines e-mail response latency as an expectancy violation and explores its impact. Managers evaluate job candidates who varied in their response latency to an e-mail (1 day, 2 weeks, and silence for more than a month) and in their reward valence. As predicted by expectancy violations theory, candidate reward valence moderates the effec...
Chapter
A virtual knowledge-building community is a group of people who collaboratively produce knowledge through an online-mediated environment. The process and means for sharing and producing knowledge in such a community can be described as a place where “knowledge creation is built into the social fabric and into the technologies that support knowledge...
Article
A motivational perspective on media use habits is used to examine the effects of cable television on use of other media. Evidence from the Columbus, Ohio, Qube market suggests that cable both replaces and supplements preexisting media habits.
Article
Common knowledge, whereby everybody knows something, and everybody knows that everybody knows it, and so on ad infinitum, is claimed to be central to coordination in organizations. However, this claim has so far not received empirical support, as a method to empirically compare common knowledge with other forms of knowledge has not been available....
Chapter
Full-text available
The online encyclopedia Wikipedia has been one of the prominent phenomena in the emergent of online user-generated content. This study explores Wikipedians' (Wikipedia users) perceptions of Wikipedia knowledge, their sense of community and motivations for participating in Wikipedia. We suggest utilizing the constructivist approach to knowledge, as...
Article
Full-text available
The low costs and simplicity of online dialogic elements offered by the Internet and WWW make them especially important for nonprofit associations (Esrock & Leichty, 1998; Heath, 1998). Since research points to a gap between the dialogic potential of the organizational Web site and its actual implementation, the current study aims to explore whethe...
Article
In this case study, wiki technology was applied to the development of an introductory academic textbook on information systems. While the development, production and distribution of traditional textbooks are influenced by commercial interests, the wikitextbook was developed collaboratively by faculty and by students, and was made available online f...
Conference Paper
Full-text available
All information exchange on the Internet - whether through full text, controlled vocabularies, ontologies, or other mechanisms - ultimately requires that that an information provider and seeker use the same word or symbol. In this paper, we investigate what happens when both searchers and authors are dynamically choosing terms to match the other si...
Conference Paper
Full-text available
Question and answer (Q&A) sites such as Yahoo! Answers are places where users ask questions and others answer them. In this paper, we investigate predictors of answer quality through a comparative, controlled field study of responses provided across several online Q&A sites. Along with several quantitative results concerning the effects of factors...
Article
Full-text available
Cyberspace has introduced new and intriguing means for knowledge shar- ing as well as new structures of mediated knowledge-building communities. Considering the various forms of online communities, it should be difficult to overstate the significance of Wikipedia as a landmark in building communal knowledge repositories. Wikipedia is an online coll...
Chapter
Recommendation systems can play an extensive role in online learning. In such systems, learners can receive guidance in locating and ranking references, knowledge bits, test items, and so forth. In recommender systems, users’ ratings can be applied toward items, users, other users’ ratings, and, if allowed, raters of raters of items recursively. In...
Article
Networks offer the promise of sharing information. This project aims to experimentally investigate aspects of the propensity to share information online, with a specific focus on the system-induced status of information. Is a simple manipulation of the cognitive status of information sufficient to gain changes in sharing levels? A simple computeriz...
Article
Recommendation systems can play an extensive role in online learning. In such systems, learners can receive guidance in locating and ranking references, knowledge bits, test items, and so forth. In recommender systems, users’ ratings can be applied toward items, users, other users’ ratings, and, if allowed, raters of raters of items recursively. In...
Article
Full-text available
This chapter reports on computerized simulation / games developed and used in graduate and executive education of managers (MBA programs). Managers may be among the toughest candidates for education. Online, computerized and network-mediated simulations amplify many of the traditional advantages of games in learning, and may be part of the solution...
Article
Full-text available
SHIL on the Web is the Website of the Israeli Citizens' Advice Bureau. It provides information about rights, social benefits, government and public services and civil obligations. Activity on the site approaches 10,000 pages visited per day. It has interfaces in four languages: Hebrew, Arabic, Russian and English. Logfile analysis of the SHIL Websi...
Article
Full-text available
What are the antecedents, inhibitors and catalysts to providing information and participating in mixed fee-based and free online contexts? We describe the behaviour of about 500 Researchers in the Google Answers online service and over 70,000 questions posed on this system over a 29 month period. Google Answers is a fee-based environment. Answers p...
Article
Full-text available
This study examines the chronemics of response latencies in asynchronous computer-mediated communication (CMC) by analyzing three datasets comprising a total of more than 150,000 responses: email responses created by corporate employees, responses created by university students in course discussion groups, and responses to questions posted in a pub...
Conference Paper
SHIL on the Webp is the website of the Israeli Citizens’ Advice Bureau. This is a high traffic site, where the sources of most of the external hits are result pages of general search engines. In this paper we analyzed these external hits with an emphasis on the specific queries submitted to the general search engines (e.g., Google and MSN). The fin...
Article
This is an empirical, experimental investigation of the value of information, as perceived through the willingness to purchase information (WTP) and the willingness to sell it (accept payment, WTA). We examined the effects of source nature: expertise versus content, and source status: copy versus exclusive original of information on the WTA-WTP rat...
Conference Paper
Full-text available
The asymmetry of activity in virtual communities is of great interest. While participation in the activities of virtual communities is crucial for a community's survival and development, many people prefer lurking, that is passive attention over active participation. Lurking can be measured and perhaps affected by both dispositional and situational...
Conference Paper
Full-text available
Faculty from five universities will discuss their groups' respective teaching and learning wikis. The group assembled here represents several divergent approaches and projects to harnessing the collaborative and open-source nature of Wikis to the tasks of teaching, educating inquiry and training.We will discuss and compare Wiki projects that cover...
Conference Paper
How can we improve the acceptance of recommendations in collaborative systems? The group identity of recommenders and recipient involvement in group formation impacts on the likelihood that users of social collaborative systems would accept recommendations provided on it. We introduce the term 'friends group' to describe a sub-group of the