Usability of Big Data Resources in Visual Search Interfaces of Repositories Based on KOS

Digital repositories allow storage and manage digital resources and collections of museums, libraries, archives in order to be use in educational context. Unfortunately, several deficiencies in user interfaces based on resource discovery, user-centered design, and strategy of search, among others, prevent the widespread use of the valuable services that data of repository offers. Having the intuition that some deficiencies are reflected in usability problems associated with interfaces, we conducted a research from the Human Computer Interaction (HCI) perspective in order to present a novel framework to evaluate usability of different types of visual interfaces based on visualization techniques and Knowledge Organization System (KOS). Our study analyzed the efficacy of a framework in order to allow repository creators the assessment and selection of appropriate user interfaces according to the needs and demands of the data collection of learning objects. The preliminary results show that framework could improve the select of appropriate visualization techniques after to development of them in a digital repository. Although, some problems associated with the limited computational capabilities for information visualization are difficult to overcome.