“…-PA increases awareness of the subject, including that didn't understand or overlooked; -PA informs whether everyone understands in the same way thus reducing misunderstandings (Goulão & Menedez, 2015); -PA shows the ability to interpret tasks and solutions differently based on own experience, and different ways of thinking (Kilickaya, 2017); -others' performance in PA can be an example of improving own work (Reinholz, 2016); -in PA new knowledge is applied in practice both when carrying out a task and when assessing peer task; -PA encourages valuable and interesting discussions about task, experience (Panadero, Jonsson, & Alqassab, 2018); -PA provides a view from the sidelines because it's hard to spot the flaws of own work (Van der Berg, Admiraal, & Pilot, 2006); -PA is an opportunity to learn to listen the objective criticism and to improve communication (Gennip, Segers, & Tillema, 2009). The set of peer assessment challenges similarly obtained from statements: -PA difficulty with unfamiliar people because it's impossible to know how they to take criticism (Rowe & Fitness, 2018); PA is risky for people with low self-esteem (Rowe & Fitness, 2018); -lack of communication skills (Topping, 2017); -excitement on how others will assess the work; -inappropriate PA: too loyal or too harsh criticism, lack of objectivity or lack of knowledge on the specific nature of the sector (Gennip, Segers, & Tillema, 2009); It appears that some of the opportunities are also identified as challenges because adult learners have very different skill levels and experience (Hodgson, & Kambouri, 1999;Ivanova, 2016;Pastogianni & Koutsoukos, 2018). These sets of peer assessment characteristics allow conclusions and recommendations to be drawn up.…”