Table 2.

Reasons for exclusion of behavior change techniques following study 1.

Behavior change technique	Reason for exclusion
8.4. Habit reversal	Missing taking medication was not thought to be habit; therefore it was thought there was no habit to reverse in the sense psychologists think of habits
11.3. Conserving mental resources	Participants couldn’t find a way to operationalize this that wasn’t also habit formation. In addition, there was concern that suggesting people with type 2 diabetes focus on medication adherence alone could devalue other important lifestyle messages (eg, diet and physical activity) that are also key to diabetes self-management
12.2. Restructuring the social environment	Participants found it hard to structure messages that didn’t seem to suggest stopping seeing people
13.1. Identification of self as a role model	Participants did not feel a single health behavior such as taking medication as prescribed constituted an identity and therefore would be hard to model oneself as a role model
13.2. Framing/reframing	Hard to use without interaction; would need to know how someone is framing to start with in order to initiate change. This was not thought to be possible in a text message
13.3. Incompatible beliefs	Thought to be better used in a therapeutic situation rather than via text message
15.3. Focus on past success	Designed to react to what someone has said, this would be difficult to deliver outside of a therapeutic situation as the text message system would not know if someone had had past successes or not