An Item Response Theory Approach to Enhance Peer Assessment Effectiveness in Massive Open Online Courses

Massive Open On-line Courses (MOOCs) are effective and flexible resources to educate, train, and empower populations. Peer Assessment (PA), provides a powerful pedagogical strategy to support educational activities and foster learners’ success, also where a huge number of learners is involved. Item Response Theory (IRT) can model students’ features, such as the skill to accomplish a task, and the capability to mark tasks. In this paper we investigate the applicability of IRT models to PA, in the learning environments of MOOCs. Our main goal is to evaluate the relationships between some students’ IRT parameters (ability, strictness) and some PA parameters (number of graders per task, and rating scale). We use a data-set simulating a large class (1,000 peers), built by a Gaussian distribution of the students’ skills to accomplish a task. The IRT analysis of the PA data allow to say that the best estimate for peers' ability is when 15 raters per task are used, with a [1,10] rating scale.