Shakespearean tragedy is the designation given to most tragedies written by which playwright, several hundred years after Shakespeare's death, scholar F.S. Boas also coined a fifth category, in Shakespeare studies, the problem plays are three plays, wrote between the late 1590s and the first years of the seventeenth century: "All's Well That Ends Well", "Measure for Measure" and "Troilus and Cressida"?