The primary reasons for outsourcing internal audit activities typically include accessing a wider range of skills and competencies, complementing existing expertise for specific engagements, and strengthening core audit functions. Contingency planning, while beneficial, is not a primary reason for outsourcing internal audit activities as it pertains more to risk management strategies rather than the core objectives of outsourcing. Reference: = IIA's Practice Advisory 1210.A1-1: Obtaining External Service Providers to Support or Complement the Internal Audit Activity.