Smoking is the source of fundamental health problems. Activities have been organised throughout the world so that smokers and non-smokers do not encounter smoking-related health problems in society. One such activity is the combined health warnings designed to be printed on cigarette packets. The warnings on cigarette packets are considered as an instrument of education to develop the desired attitudes in individuals by improving their knowledge of health. This research aims to evaluate the effects of 14 combined health warnings printed on cigarette packets on smokers and non-smokers. This is a descriptive research, and it employs a correlation model. The research group was composed of 57 individuals participating in the research on the basis of volunteering. The data were collected through eye-tracking and by means of two forms. According to the findings, the combined warnings on cigarette packets were moderately influential and they were remembered at low levels. It was also found that the participants were familiar with the combined warnings on cigarette packets and that they avoided the warnings. These results demonstrate that the warnings should be re-evaluated by taking diverse demographic properties into consideration. Key words: cigarette packet, combined health warnings, eye movements, university student, health education.

The main aim of this thesis is to analyze and comparatively evaluate the usability of touch screen mobile applications through cognitive modeling and end-user usability testing. The study investigates the accuracy of the estimated results cognitive model produces for touch screen mobile phone interfaces. CogTool application was used as the cognitive modeling method. Turkcell Cüzdan application, which is suitable for the implementation of both methods, was chosen as the mobile application. Based on the feedback given by the developer of the application, 8 tasks were determined, considering the most widely used actions and critical operations on the application. 10 people who had not used the application before were selected and user tests were conducted in a usability laboratory. Since CogTool gives skilled users' performance prediction, the test was performed twice. CogTool predictions were compared with the second test results. The results obtained from CogTool were analyzed step by step, and tasks were compared on the basis of step time and total task completion time. This study reveals that CogTool gives approximate estimations with actual user performance on touch screen mobile phone application interfaces. However, if there are special cases in the tasks such that users v are very accustomed to the steps or decision-making is involved in the tasks, the "Think Operation" in CogTool should be changed appropriately or it should be deleted. In addition, this study shows that performing cognitive modeling method requires one third of the time needed for conducting end user tests. Furthermore, the results reveal that CogTool can be used for measuring some factors which affect user satisfaction level.

Social media use is on the rise throughout the world. Influenced by this trend, governments of all levels and sizes are establishing their social media (like Facebook) presence due to the communication and interaction capabilities that such a presence brings. This study examines and explains the social media presence of Turkish local governments from a usability perspective. Usability studies provide governments with important empirical data about the citizens'/users' view/perception of the efficiency, effectiveness and satisfaction of web-based content. Consequently, there is a need for usability testing of government social media services.The analysis of local government social media sites through scientific usability methods, such as expert review, guidelines and eye-tracking, reveals the strengths and weaknesses of government social media services in terms of usability. The study concludes with specific recommendations for improvement of government social media presence, which are applicable, to a great extent, to governments of all levels and sizes in Turkey and elsewhere.

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Social media use is on the rise throughout the world. Influenced by this trend, governments of all levels and sizes are establishing their social media (like Facebook) presence due to the communication and interaction capabilities that such a presence brings. This study examines and explains the social media presence of Turkish local governments from a usability perspective. Usability studies provide governments with important empirical data about the citizens'/users' view/perception of the efficiency, effectiveness and satisfaction of web-based content. Consequently, there is a need for usability testing of government social media services. The analysis of local government social media sites through scientific usability methods, such as expert review, guidelines and eye-tracking, reveals the strengths and weaknesses of government social media services in terms of usability. The study concludes with specific recommendations for improvement of government social media presence, which are applicable, to a great extent, to governments of all levels and sizes in Turkey and elsewhere.