In the field of human factors engineering the issue of how to present electronic text to people has been studied intensely for over 35 years. However, one major consideration that has largely been overlooked in these studies is how visual impairments affect reading of computer text. Specifically, the issue of how text can be modified to improve readability of CRTs for individuals with low vision. A 2x5x2x3 (visual capability, font size, polarity, and contrast) mixed-factor, repeated-measures experimental design was used to determine if changes in font size, contrast polarity, and/or contrast can improve reading speeds and reduce error rate for people with low vision. The results of this experiment show that alterations in text can be made that do not affect unimpaired vision readers while dramatically improving the reading capabilities of the impaired vision population. For character size, 12 and 14 point font sizes were found to be too small for the visually impaired population examined. In general, 18 and 30 point font sizes were equal to each other and to the 24 point font size, but for some interactions these two were found to produce longer response times and higher error rates. Thus, a 24 point font size is recommended. Unlike previous research with visually impaired participants, this experiment found that negative (white-on-black) polarity worsened reading performance. It is thought that this discrepancy is a result of polarity's interaction with small font sizes. For this reason, it is recommended that for font sizes of 18 points and below, positive polarity should be used. For 24 and 30 point sizes either polarity is satisfactory, though previous research (Legge, Pelli, Rubin, and Schleske, 1985b; NRC, 1995; Rubin and Legge, 1989) suggests negative polarity might be better for some visually impaired readers.. Contrasts of 3:1, 7:1, and 18:1 were used in this experiment and had no significant effect for either vision group. However, contrast did significantly interact with both font size and polarity. For font sizes of 18 points or below, it is recommended that contrasts of 18:1 be used for either polarity, but this is very important if negative polarity is used. The above recommendations are based on a small group of impaired vision readers. Visual impairments vary widely and the sample used in this experiment represented only a portion of them, with respect to both cause and severity. Wherever possible, computer text should be tailored to the unique needs of its users. / Master of Science

This thesis documents Phase III of a research program undertaken by the Virginia Transportation Research Council and the Virginia Tech Transportation Institute in cooperation with the 3M Company and the Virginia Department of Transportation for the evaluation of visual performance of retroreflective signs of various color combinations. Phase I was an off-road field experiment conducted to determine the best sign color combination, letter stroke width, and letter size for the emergency sign. Based upon the results of Phase I, three color combinations were chosen for testing (black on coral, black on light blue, and yellow on purple) against a baseline color combination of black on orange.Phase II was conducted using an instrumented vehicle through a construction zone-related detour. Questionnaire data were also obtained. The independent variables of interest were sign color combination, age, and visibility condition. The findings of Phase II indicated that use of a color combination other than the traditional black on orange sign would improve driver performance and safety when used for trailblazing during critical incidents, especially when the incident route overlaps a work zone detour. A serious limitation of Phases I and II is that the use of fluorescent colors was not evaluated. Anecdotal evidence suggests that the use of fluorescent colors on signs improves their conspicuity. The purpose of Phase III was to evaluate fluorescent sign color combinations for incident management trailblazing purposes. This study consisted of an on-road investigation using an instrumented vehicle over a 12.2-mile route in urban and rural areas of Montgomery County, Virginia. The following conclusions were made:*A non-fluorescent yellow on non-fluorescent purple sign is least preferred by both older and younger drivers when compared to the other sign color combinations employed in this study.*Both younger and older drivers have a preference for a black on fluorescent yellow-green sign.* Fewer late braking maneuvers and fewer turn errors were recorded during daytime conditions than during nighttime conditions. *Older drivers tended to register more late braking maneuvers than did younger drivers. / Master of Science

Farmers markets (FM) have become increasingly popular almost tripling over the past two decades due to the rising interest in local and/or organic foods. Within this same time period, notable farmers market foodborne illness outbreaks; such as E. coli O157:H7 and strawberries and Salmonella and peas; have occurred, and emphasize the importance of food safety practices at farmers markets. Some farmers may be encouraged to follow Good Agricultural Practices (GAPs) to limit the contamination of fresh produce; however, GAPs programs are complex and also very driven by wholesale buyers. Furthermore, many FM growers are unfamiliar with GAPs or do not believe it is applicable to them. The Food Safety Modernization Act (FSMA) was passed in 2011, and shifted the food safety paradigm from a reactive to proactive approach introducing seven different rules including the Preventive Controls for Human Foods (PCHFR) and the Produce Safety Rule (PSR). Each FSMA rule does contain exemptions for smaller-scale operations (e.g., farms, facilities) that allows them to be excluded from the rule, or excluded from certain aspects of the rule. Generally, most FM vendors may satisfy exemptions from the FSMA regulations (e.g., be exempt from the FSMA Produce Safety Rule because of commodities); however, to our knowledge, no studies have assessed the regulatory compliance requirements of FM vendors to the FSMA regulations. This dissertation explored the regulatory requirements of FM vendors, and the accessibility of FSMA materials for these audiences. Additionally, due to the sudden and unprecedented global COVID-19 pandemic, an objective was added that explored how COVID-19 influenced behavior changes among this audience. Interviews were conducted and found that all vendors (100%) were exempt from the PCHFR and that most vendors (67%) were exempt from the PSR, some were qualified exempt (28%), and a few (5%) were covered. This study also found that farmers market vendors received information mainly from University Cooperative Extension sources. The COVID-19 pandemic greatly impacted hygiene and health practices at FMs. Market personnel (managers and vendors) implemented many different hygiene and health practices at their markets. The major source of COVID-19 food safety information for market personnel was local and federal government; as well as University Cooperative Extension. Accessibility analyses showed that many FM or COVID-19 resources were not accessible due to populations that rely on produce safety resources generated by Cooperative Extension due to (i) navigation or web accessibility errors, (ii) high literacy level requirements, and (iii) lack of keep (i.e., resources were not up-to-date, or continuously managed or monitored). These findings will inform the development of FM targeted resources, that are also, accessible to a more diverse and inclusive audience. One example is a produce safety resource on the updated agricultural water requirements that is developed to an 8th grade reading level, with no broken links or additional navigations errors, and if a PDF version is available, proper headers and titles. / Doctor of Philosophy / Farmers markets (FMs) have increased in popularity over the two decades with because of interest by consumers to support local agriculture, buy organic products, or because they believe these foods to be safer from bacteria and viruses. Shopping at a FMs does not necessarily make the products any safer compared to buying it from a grocery store. It is important that farmers markets follow proper food safety practices during the growing, harvesting, and preparation of produce for sale. One example is the prevention of animal feces from getting on the produce or in a water source that would be used. Another would be to follow proper hygiene practices such as handwashing after using the bathroom. These two examples and others are detailed in a law passed by President Obama in 2011 called the Food Safety Modernization Act (FSMA), which allows the Food and Drug Administration to begin its proactive instead of reactive food safety approach. FSMA does not have to be followed by all food entities. Depending on how much a farm makes in revenue (<$25,000) or if they grow products deemed as "not risky,", they may be exempt. These types of products such as potatoes, beets, and corn are safer because they will be cooked before consumption killing any bacteria or viruses that may exist. Other products such as romaine lettuce and tomatoes are usually consumed fresh without cooking and are thus riskier if there are any bacteria or viruses on it. Interviews were conducted to understand if farmers market vendors need to comply with FSMA. Most vendors are not required to follow FSMA because they gross less than $25,000 or their products were already covered by other food safety regulations such as meat being covered by the USDA. Additionally, how the COVID-19 pandemic influenced FMs was explored. Two surveys, one for vendors and one for managers, were distributed to stakeholders. FMs adapted really well to the challenging COVID-19 landscape and implemented COVID-19 preventive measures such as social distancing, mask wearing, and providing hand sanitizer and handwashing stations to continue to operate and keep their customers and employees safe. After understanding the characteristics and the unique challenges to food safety implementation that these market personnel may face, additional research was done to understand if currently available resources were accessible. Accessibility was evaluated using website and PDF accessibility checkers and a readability level checker. Resources should be easy to navigate and written to around a 8th grade level to make it easy to understand. There is a lack of well-crafted, accessible resources that address the unique challenges that farmers market personnel may face. These considerations should be considered when creating these materials.

Staff of the Cooperative Extension Service develops and distributes educational publications to inform the public of practical applications of research information. However, many of these publications are written in a technical style that makes them difficult for the average 4-H member and adult leader to understand the subject matter presented. The purpose of this study was to investigate a systematic process for improving the understanding or comprehensibility of these educational publications. A model of a publication development process based on learning principles was created. This study investigated the effectiveness of the model with Extension subject-matter specialists developing publications for 4-H youth. Specifically, this study was conducted in three parts: the model of the text-development process was taught to subject-matter specialists; the specialists in turn used the model to develop educational texts for 4-H youth; and finally comprehensibility testing of the text passages produced by the specialists with 4-H youth members and adult leaders was conducted. This study confirmed that the utilization of learning principles within the text-development process can improve the comprehensibility of subject matter information presented in Extension educational publications. / Ph. D.

Stroke is a leading cause of death and disability worldwide [8], underscoring the need for effective digital solutions for stroke patients, caregivers, and healthcare professionals. Given that, this thesis aims to evaluate quality aspects of usability, accessibility, and readability of stroke-related mobile health (mHealth) applications, with the primary objective of identifying strengths and weaknesses to enhance user experience and app quality. This study assessed sixteen stroke-related apps through a comprehensive methodology, including accessibility testing with the Google Accessibility Scanner, Mobile Application Rating Scale (MARS) evaluation, heuristic evaluation, and readability assessment. Key findings indicate significant issues with touch target sizes and text contrast, which are crucial for users with impaired visionand motor skills. MARS evaluations revealed that “Constant Therapy” excelled in engagement and functionality due to its interactive features and personalized schedules. At the same time, “Stroke Recovery Predictor” and “Conversation Therapy Lite” scored lower due to limited functionality and unclear interfaces. The heuristic evaluation highlighted frequent violations of the visibility of system status and insufficient error messaging. Readability assessments showed a range of reading difficulty levels, with some apps lacking privacy policies that could be found either within the application or on the developer’s website. The study provides actionable recommendations for developers, such as improving touch target sizes, improving text contrast, increasing functional variety, optimizing navigation, and ensuring privacy policy transparency. Addressing these areas can significantly improve the usability and accessibility of stroke-related mHealth apps, ultimately supporting better health outcomes and quality of life for stroke survivors. Future research should involve more evaluators, use multiple assessment tools, and focus on specific types of stroke apps to refine the evaluation process and provide more targeted insights.

In 2016 employers hiring four-year college graduates indicate that 27.8% have deficiencies in written communication. Postsecondary learning objectives should focus on improving specific writing skills like grammar, sentence structure, and vocabulary usage for individual students and monitoring text readability as an overall score to measure learning outcomes. Web-based applications and the tools integrated into them have the potential to serve as a diagnostic solution for analyzing the text readability and writing skills of students. Organization and structuring of Canvas data was required before adding text readability and other writing skills analytics as part of the process to develop diagnostic learning analytics that interprets student writing skills in the learning management system. Decision modeling was used to capture and describe the specifics of literacy improvement decisions for instructors and administrators in a graphical notation and structured format.

Det är ofta äldre personer behöver besöka 1177.se och på grund av att samhället och dess information har blivit alltmer digitaliserad blir det svårare för den äldre generationen som inte växt upp med den nu moderna tekniken. Detta examensarbete handlar om hur äldre som är ovana internetanvändare förstår och uträttar ärenden med hjälp av 1177:s e-tjänster. Examensarbetets syftet är att bidra med kunskap om hur information kan designas för att underlätta för äldre att använda ett digitalt verktyg för vårdrelaterande ärenden. Med hjälp av tidigare forskning inom teknikinformation, klarspråk, skärmläsning och olika medier samt text och bild i samverkan, går det att förbättra tillvägagångsättet för målgruppen när de ska förnya ett recept med hjälp av 1177:s e-tjänster. Metoderna som används i den empiriska undersökningen är intervjuer, textanalys och deltagande observationer. Syftet med metoderna är att studera den befintliga informationsdesignen på 1177.se och få en djupare förståelse för målgruppens tillvägagångssätt och användarupplevelse. Examensarbetet innehåller ett gestaltningsförslag baserat på tidigare forskning samt resultaten från de empiriska studierna i form av en guide som stegvis beskriver hur användaren ska göra för att utföra tjänsterna på 1177.se. / It is often elderly people that need to visit 1177.se. Because society and its information have become increasingly digitized, it is becoming more difficult for the older generation to reach the information. The survey in this study deals with how people from the age 50 understand and use 1177's e-services. In this work, theories within technical communication, plain language, screen reading and various media as well as text and image in collaboration is used. Studies has been conducted to gather empirical data about how the elderly understand information design to use 1177.se e-service. The methods used are interviews, text analysis and participant observation. On the basis of the empirical results an information design, as a step-by-step guide is proposed on how it could be easier for the user.

This study compares two sets of teaching material, Förstagluttarna and Den magiska kulan, both of which are designed to teach reading in grade 1. The aim is to investigate the potential of the two sets of material to promote the pupils’ reading development. The study uses a content analysis in which categories have been established to assess the readability of the material and its ability to create motivation. The result shows that the readability is the same overall, but there are noticeable differences in the ability of the material to motivate pupils to read.

This thesis examines the scientific language in different subjects by analysing all grade 8 science items from TIMSS 2011, using four characteristic meaning dimensions of scientific language – Packing, Precision and Presentation of information, and the level of Personification in a text. The results, as well as results from established readability measures, are correlated with test performances of different student groups. The TIMSS vocabulary is compared with three Swedish corpora where low frequency words are identified and further analysed. The thesis challenges the notion that there is a single scientific language, as results show that the language use varies between subjects. Physics uses more words, biology shows higher Packing and lower Precision, while physics shows the opposite pattern. Items are generally low in Personification but physics has higher levels, earth science lower. Chemistry often presents information in more complex ways. The use of meaning dimensions manages to connect the language use in science items to student performance, while established measures do not. For each subject, one or more of the meaning dimensions shows significant correlations with small to medium effect sizes. Higher Packing is positively correlated with students’ results in earth science, negatively correlated in physics, and has no significant correlations in biology or chemistry. Students’ performances decrease when placing items in everyday contexts, and skilled readers are aided by higher precision, while less-skilled seem unaffected. Many meaning dimensions that influence low performers’ results do not influence those of high performers, and vice versa. The vocabulary of TIMSS and school textbooks are closely matched, but compared with more general written Swedish and a more limited vocabulary, the coverage drops significantly. Of the low frequency words 78% are nouns, where also most compound–, extra long– and made-up words are found. These categories and nominalisations are more common in biology and, except for made-up words, rare in chemistry. Abstract and generalizing nouns are frequent in biology and earth science, concrete nouns in chemistry and physics.

Hypotheses on the efficiency of evidence-based printed materials can be directed by health communication concepts. These concepts can provide a general framework that goes beyond the traditional vulgarization point of view: instead, it points towards a strategy to obtain health outcomes and provoke behavior change, from a disease prevention, management and health promotion perspective. The present study proposes a comprehensive framework based on concepts from health risk communication, Tarde's theory of social values, usability, readability and plain language. Using the mapping approach, an evaluation grid was applied to printed evidence-based materials with proven effectiveness, in order to reveal the underlying strategy and isolate the characteristics of effective materials. The results allowed us to define two types of printed evidence-based materials, according to the robustness of the evidence they contain and the target audience. It was also possible to identify indicators of notions that are translated into operationalized items, frequent in those materials that might be responsible for their efficiency: clear purpose of the documents, limited scope, learning motivation and correspondence to the logic, experience and language of readers. Effectiveness of printed evidence-based materials could also be correlated to numeracy, objectiveness, standard definitions, constant timeframes and denominators, risks enumerated in order of importance, effective response, and high degree of threat, urgency, novelty and visibility of the disease. It was also possible to identify some missing communication concepts: cultural diversity, narrative, increased easiness of procedures and aesthetic advantage for the patient. In the process of work, the theory of social values emerged as a dynamic component that can bring together and explain many concepts, as well as physician’s acceptance of the guidelines. Value in terms of usefulness and truth plays a major role in cognitive appreciation of the documents. This concept gives a strategic meaning to the whole work and allows us to better understand attitude and behavior change.