class Applicant < ActiveEngineer require 'mad_skills' is an odd way to express it, because it doesn't actually say that Applicant has MadSkills. Presumab

class Applicant < ActiveEngineer require 'mad_skills' is an odd way to express it, because it doesn't actually say that Applicant has MadSkills. Presumably they mean: require 'mad_skills' class Applicant < ActiveEngineer include MadSkills