public ICollection <CriterionNode> GetLowestCriterionNodes()
{
return(GoalNode.SearchChildNodes <CriterionNode>((node) => node.SubcriterionNodes.Count == 0));
}
public bool ContainsCriterionNode(CriterionNode node)
{
return(GoalNode.SearchChildNodes <CriterionNode>(x => x == node).Count == 1);
}