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.
baseline (plural baselines) 1  A line that is a base for measurement or for construction. A laser level generates a convenient baseline for interior work. 2  A datum used as the basis for calculation or for comparison. We used the last doctor visit to provide baselines for vital statistics.