Snowball sampling is a non-probability sampling technique that is used by researchers to identify potential subjects in studies where subjects are hard to locate.nowball sampling is a non-probability sampling technique that is used by researchers to identify potential subjects in studies where subjects are hard to locate.
In configuration management, a baseline is an agreed description of the attributes of a product, at a point in time, which serves as a basis for defining change. A change is a movement from this baseline state to a next state. The identification of significant changes from the baseline state is the central purpose of baseline identification.
3.5: Establishing Security Baselines. Before you can recognize abnormal system behavior as a sign of attack, you need to know what normal behavior is. In other words, you need a security baseline. In setting a baseline, it is important to harden or lock down your servers and networks at a level where incursions are less likely to occur. These exercises introduce you to the concepts of operating system, network, and application hardening.