Abstract
Existing gamification services have features that preclude their use by e-learning tools. Odin is a gamification service that mimics the API of state-of-the-art services without these limitations. This paper describes Odin, its role in an e-learning system architecture requiring gamification, and details its implementation. The validation of Odin involved the creation of a small e-learning game, integrated in a Learning Management System (LMS) using the Learning Tools Interoperability (LTI) specification.

Abstract
Automated assessment is an essential part of eLearning. Although comparatively easy for multiple choice questions (MCQs), automated assessment is more challenging when exercises involve languages used in computer science. In this particular case, the assessment is more than just grading and must include feedback that leads to the improvement of the students’ performance. This paper presents ongoing work to develop Kora, an automated diagram assessment tool with enhanced feedback, targeted to the multiple diagrammatic languages used in computer science. Kora builds on the experience gained with previous research, namely: a diagram assessment tool to compute di erences between graphs; an IDE inspired web learning environment for computer science languages; and an extensible web diagram editor. Kora has several features to enhance feedback: it distinguishes syntactic and semantic errors, providing specialized feedback in each case; it provides progressive feedback disclosure, controlling the quality and quantity shown to each student after a submission; when possible, it integrates feedback within the diagram editor showing actual nodes and edges on the editor itself. © Hélder Correia, José Paulo Leal, and José Carlos Paiva

Abstract
Mooshak is a web system with support for assessment in computer science. It was originally developed for programming contest management but evolved to be used also as a pedagogical tool, capitalizing on its programming assessment features. The current version of Mooshak supports other forms of assessment used in computer science, such as diagram assessment. This form of assessment is supported by a set of new features, including a diagram editor, a graph comparator, and an environment for integration of pedagogical activities. The first attempt to integrate these features to support diagram assessment revealed a number of shortcomings, such as the lack of support for multiple diagrammatic languages, ineffective feedback, and usability issues. These shortcomings were addressed by the creation of a diagrammatic language definition language, the introduction of a new component for feedback summarization and a redesign of the diagram editor. This paper describes the design and implementation of these features, as well as their validation. © Springer Nature Switzerland AG 2018.

Abstract
Learning to program is hard. Students need to remain motivated to keep practicing and to overcome their difficulties. Several approaches have been proposed to foster students’ motivation. As most people enjoy playing games of some kind and play on a regular basis, the use of games is one of the most widely spread approaches. However, taking full advantage of games to teach specific concepts of programming requires much effort. This paper presents Asura, a game-based assessment environment built on top of Mooshak that challenges students to code Software Agents (SAs) to play a game, allowing them to test the SAs against each others’ SAs and watch a movie of the test. Once the challenge development stage ends, teachers are able to organize game-like tournaments among SAs. One of the key features of Asura is that it provides a means to reduce the required effort of building game-based challenges up to that of creating traditional programming exercises. © José Carlos Paiva and José Paulo Leal.

Abstract
Quizzes are a widely used form of assessment, supported in many e-learning systems. Mooshak is a web system which supports automated assessment in computer science. This paper presents Moozz, a quiz assessment environment for Mooshak 2.0, with its own XML definition for describing quizzes. This definition is used for: interoperability with different e-learning systems, generating HTML-based forms, storing student answers, marking final submissions and generating feedback. Furthermore, Moozz also includes an authoring tool for creating quizzes. The paper describes Moozz, its quiz definition language and architecture, and details its implementation. © Hélder Correia, José Paulo Leal and José Carlos Paiva.

Abstract
IDEs are environments specialized in support during the development of programs. They contain several utilities to code, run, debug, and deploy programs quickly. However, they do not provide the automatic assessment of programming exercises, which is required in both learning and competitive programming environment. Therefore, IDEs are often underestimated in these contexts and replaced by basic code editors. Yet, IDEs have unique features which are essential for programmers, such as the debugger or the package explorer. This paper presents Raccode, a plugin for assessment of programming exercises in Eclipse. This plugin integrates with Mooshak to combine the diverse capabilities of an IDE, like Eclipse, with the automatic evaluation of exercises, clarification requests, printouts, balloons, and rankings. It can be used both in competitive and learning environments. The paper describes Raccode, its concept, architecture and design. © André Silva, José Paulo Leal, and José Carlos Paiva.