Key Activities case (the average was 63 days in 2017 and 81.5 days in 2019). It is assessed as having a positive effect on enhancing the work flow of the Commission, even though it handles cases that are obviously bound to be dismissed. [Table 2-2-12] Number of Petitions Assigned to and Closed by Preliminary Investigation (Unit : cases) Petitions assigned Period Total cases assigned Petitions closed Assigned to the Preliminary Investigation and Mediation Team Total cases closed Closed by the Preliminary Investigation and Mediation Team Total 12,930 2,345 (18.1%) 13,285 2,313 (17.4%) 2019 9,706 1,792 (18.5%) 9,136 1,787 (19.6%) August-December 2018 3,224 553 (17.2%) 4,149 526 (12.7%) 2. Mediation Petitions In 2019, nine mediation petitions were filed, which is 13 cases less compared to the previous year. One case was closed by mediation, which represents six cases less from a year ago. In 2019, the ratio of mediation petitions filed to total petitions filed was low at 0.1% (nine mediation petitions out of 9,737 petitions), remaining largely unchanged from 0.2% in 2018 (22 mediation petitions out of 9,285 petitions) and 0.3% in 2017 (36 mediation petitions out of 12,336 petitions). Given the need for a more fundamental institutional approach to facilitating mediation, the Commission will work on the amendment of the NHRCK Act to introduce a one-person mediation system and revisit the Conciliation Committee regulations to streamline the referral procedures. 116