Abstract
This paper presents an on-going work around accessibility issues within the use of social media. With a lack of background in this field, the purpose of the study was to analyze the accessibility levels of different social media websites and aggregators. Based on W3C Web Content Accessibility Guidelines, we have selected three automatic evaluation tools in order to realize a first set of preliminary tests. We verified that none of the websites clearly passed in the evaluation process and our sample didn't meet the adopted accessibility guidelines. The errors occurrence within the social media aggregators' tests was less than in the social media websites. Therefore, it seems to be indisputable to propose a tool that allows users to manage their own social media websites accounts in a more accessible way. Thus, this study presents a list of defined requirements to implement an accessible social media aggregator solution. © 2013 Springer-Verlag Berlin Heidelberg.

Abstract
Considering the global competitiveness the organizations ability to effectively use information technologies and bet on innovation and creativity are today commonly recognized as important. In this context, research on creativity in information systems has assumed special importance. This paper illustrates the use of Action-Research Method "in research in Information Systems and Creativity, particularized in Information Systems Planning, reflecting on the advantages of using this method in this context.

Abstract
We present Carousel-EDF, a new hierarchical scheduling algorithm for a system of identical processors, and its overhead-aware schedulability analysis based on demand bound functions. Carousel-EDF is an offshoot of NPS-F and preserves its utilization bounds, which are the highest among algorithms not based on a single dispatching queue and that have few preemptions. Furthermore, with respect to NPS-F, Carousel-EDF reduces by up to 50% the number of context switches and of preemptions caused by the high-level scheduler itself. The schedulability analysis we present in this paper is grounded on a prototype implementation of Carousel-EDF that uses a new implementation technique for the release of periodic tasks. This technique reduces the pessimism of the schedulability analysis presented and can be applied, with similar benefits, to other scheduling algorithms such as NPS-F.

Abstract
It is well known that human error in the use of interactive devices can have severe safety or business consequences. It is important therefore that aspects of the design that compromise the usability of a device can be predicted before deployment. A range of techniques have been developed for identifying potential usability problems including laboratory based experiments with prototypes and paper based evaluation techniques. This paper proposes a framework that integrates experimental techniques with formal models of the device, along with assumptions about how the device will be used. Abstract models of prototype designs and use assumptions are analysed using model checking techniques. As a result of the analysis hypotheses are formulated about how a design will fail in terms of its usability. These hypotheses are then used in an experimental environment with potential users to test the predictions. Formal methods are therefore integrated with laboratory based user evaluation to give increased confidence in the results of the usability evaluation process. The approach is illustrated by exploring the design of an IV infusion pump designed for use in a hospital context. © 2013 Springer-Verlag Berlin Heidelberg.

Abstract
Our aim was to adapt for Portuguese and validate the flexible and rigid control subscales of eating behaviour proposed by Westenhoefer et al. (1999) and to analyse their relationship with socio-demographic and anthropometric variables. One sample from the general population (n = 231) and another composed by higher education students (n = 257) were evaluated. The adaptation of the subscales involved their translation, back translation and cultural adaptation. The subscales' final version showed unifactorial structure and acceptable internal consistency in both samples (Cronbach's alpha between 0,750 and 0,817). Higher scores in each subscale correspond to higher dietary restraint. Women had higher levels of both types of control. For men age was positively associated with flexible control, and for women education was positively associated with both types of restraint. In the students' sample, rigid control significantly predicted BMI (positive association). The present study supplies an instrument to assess flexible and rigid control of eating behaviour adapted to the Portuguese population.

Abstract
A magneto-optical current sensor, based on a low birefringence SF57 glass prism, using a dual quadrature polarimetric configuration was implemented and tested aiming its application in high voltage power lines. Sensor operation is characterized and compared using distinct Super Luminescent Diodes as optical sources, with emission at 650 nm, 830 nm and 1550 nm. Calibration and resolution are obtained in the different operating conditions using a DAQ board and full digital control for signal acquisition and processing. In particular, the sensor was tested in the range from 0 to 1 kA at 50 Hz. Also, operation at different frequencies from 50 Hz to 400 Hz was compared. A robust casing was fabricated in Nylon material enabling the portability of the sensor and its application in different types of conductors. Preliminary results indicate the feasibility of using the sensor both for metering and protection applications in high-power lines with interrogation via the OPGW cable.