The definition of close placement (of wisdom) by mindfulness on phenomena is:
An exalted knower on the path, that is contained in either mindfulness or wisdom, and which meditates by investigating the general and specific characteristics of mental factors.
In short: Wisdom, a discriminating awareness is placed by mindfulness on the virtuous and non-virtuous mental factors, to investigate and differentiate their general and specific characteristics.
Focal object: The different mental factors.
They are thus either identified as belonging to the afflicted side and as object of abandonment, or as uncontaminated and belonging to the side of implementation. Through understanding that un-contaminated phenomena are the exact opposite to the afflicted mental factors, one understand that they are their only antidote, and be motivated to generate them.
Afflicted or uncontaminated, they are negated as being the self, or as belonging to an intrinsic self. They themselves are also recognized as lacking inherent nature.