When you create a child, the Verity search engine automatically assigns a default weight of 0.50 for children of topics which use the ACCRUE operator. A weight of 1.00 is assigned automatically to children of topics which use the AND or OR operators. These default weights can be manually adjusted up or down, as described in "Changing Weights" in this section. When you create a evidence topic off of a topic which uses a proximity operator, default weight of 1.00 is assigned, and it cannot be changed.