A perfect participial phrase is:
Having assessed the students’ performance on the quiz, Mrs. Bunch decided to review the causes of the Civil War.
Completed sentences are indicated by perfect participial. It is created by putting the present participle 'having' in front of the past participle. In the above sentence, the word 'having' is in front of the past participle which is ' assessed the students’ performance on the quiz.' it is also used to form the passive voice of the sentence.