For the STEM 1.2.1 release, we will revisit interventions. We've supported simple interventions in STEM even since incubation. Some examples:
1. Reducing the reproductive number of an outbreak
2. Implementing vaccinations.
STEM predicates determines when an intervention occurs. Again, currently we can do simple predicates such as after a certain period of time has elapsed in a simulation.
Use this newsgroup thread if you have ideas or requests for new features you would like to see implemented for interventions. Here's one idea: Predicates that look at the state of a disease, for instance when incidence reaches a critical threshold for a region or globally.
Looking at the state of the disease is a great idea.
We could also include the population model in the predicate.
For example, in the new demographic population model (with aging) one might
want a predicate something like
if((incidence > X)&&(populationgroup==childrenUnder2)) then....