| Construct | Operational definition | Number of measurement items | Source |
| Perceived enjoyment | The extent to which an individual perceives using LINE is enjoyable. | 3 | [7] |
| Perceived critical mass | The point at which enough individuals have used LINE so that the further rate of adoption becomes self-sustaining. | 3 | [8] |
| Self-efficacy | An individual’s beliefs about his or her capabilities to use LINE. | 3 | [9] |
| Behavioral attitude | An individual’s overall evaluation toward using LINE. | 3 | [10] |
| Subjective norms | Users’ perception of whether other important people perceive they should use LINE. | 2 | [10] |
| Perceived behavioral control | Users’ perception if they have the necessary resources and capability in successfully using LINE. | 3 | [10] |
| Usage intention | An individual’s behavioral intention to use LINE. | 3 | [7] |