In my opinion: I think that situational stuttering comes down to our expectations. Expectations like convincing ourselves that speech errors (such as, anticipation) are bad or fearful in certain situations or under certain conditions. Whether we do repetitions, prolongations, blocks or avoidance, this all is simply 'not initiating speech movements of the next planned syllable'. So, if we talk to family members, friends, people who know we stutter, or we talk to strangers, each person who stutters has associated different situations with such *disruption of speech movement initiation* (a process called [conditioning](https://www.reddit.com/r/Stutter/comments/196mdrr/comment/khui1ze/?context=3)), and thus, sometimes stuttering is affected by 'pressure', while other times by positive factors (*for example, in the previous screenshot we see that a dog positively associated the bell ringing as 'there is food'*). I draw the conclusion, that the way we perceive our own stuttering is what affects (or triggers) our stuttering in different situations. I think the main question we can ask ourselves is then, how we can stop relying on expectations such as 'needing my friends to make it easier to initiate speech movements' or 'if someone knows that we stutter, it makes sense to disrupt speech initiation for this or that reason'. This is my opinion.