Take the following as truth: Site selects itself in specific problem-for decisive testing, have to assume uniform system with regard to issue and so convenience sample acceptable; number of cases is usually one instance; comprehensive data for specific problem-for decisive testing, need more modeling, hypotheses, and targeting to know what to study; data analysis and collection concurrent and  data feed new collection, and emphasis on ruling out alternative causes; report describes instances, presents conclusions about cause, gives evidence
Then the following statement: "Number of cases is always one instance." is true, false, or inconclusive?