An external review of officer-involved shootings in 2014 and 2015 found that the city should make changes in its investigations of police shootings.
The recommendations include adjusting bureau training protocol to make it more clear what constitutes an "imminent threat" and prohibiting officers from reviewing video footage of incidents before making an initial statement.
The OIR Group also suggested that the Police Review Board consider the analysis done by the training division, which reviews whether an officers actions were in line with his or her training, before making a determination.
The report emerges days after the family of Quanice Hayes, a black teenager shot in the head by a Portland police officer, sued the city over his death. A grand jury ruled that shooting justified.
The full report will be presented in front of the City Council next Thursday.