Mutability

I am trying to search for different terms that are have similar meaning, but at the same time regard as the characteristics of liveness.

1. unpredictability 
2. dynamics
3. mutability

Well the term "unpredictability" found in many writings that are related to the field of media and performances. For example in reality TV show, the unpredictable behaviors of the actor or invited guest. Sometimes the term 'out of control' is used (Palmer) to indicate the sudden interruption of a TV program running such as breaking news. Even in the music scene, Sanden uses the term "spontaneity"and unpredictability (p.11) that are related to musicians' performance.

Software is no doubt that is regarded as one of the performances. I would say it is performative as does things once it runs, or use a more specific term "executes". Both Adrian Mackenzie (2006, p.6)  and Matthew Fuller (2003) describe software as "social software"and use the term mutability to address code as "an unstable volatile material" (from Mackenzie), a concept based on physics. Whilst Fuller uses his own collective artwork The Web Stalker to discuss the notion of mutation that associates a wider cultural process of production. He explicitly mentions the relation of mutability with liveness where subjectivity is embodied in software. In addition, that processual live is infinite (p.64).

At least both scholars who are in the field of software studies use the term 'mutability' to think about liveness in a boarder sense, towards social and material and not only focus on human actants.