| Demographics | Gender, age, education, occupation, monthly income level, region of residence, marital status |
| Travel characteristics | Number of overseas departures, airline used most, transit status and departure itinerary, purpose and duration of departure, type of companion, type of travel |
| Shopping characteristics | Reasons for using duty-free shop, purchase items and purpose, shopping time and amount, reasons for non-purchasing at airport duty-free shop, satisfaction with duty-free shops at Incheon International Airport compared to competing airports, etc. |
| Others | Intention to use in the future, additional sales items, whether the duty-free limit is appropriate, strengths and weaknesses of duty-free shops in the departure hall, and improvements |
| Product | Store brand level, diversity, product price |
| Sales-person | Salesperson appearance, expertise, kindness |
| Shop | In-store atmosphere, cleanliness, location/accessibility, interior |
| Promotion | Affiliate discount, discount coupon, event, free gift |