Following an invitation from the National Electoral Commission (NEC), the EU Election Observation Mission (EOM) was deployed on 25 January 2018 and remained in the country until 19 April 2018. The Mission assessed the entire electoral process against the national legislation pertinent to elections, regional and international obligations and commitments of Sierra Leone.
http://www.eods.eu/posts/final-report-of-eu-eom-sierra-leone-2018
http://www.eods.eu/library/eu_eom_sl_2018_final_report_4.pdf