A Select current sample, Collect current data on topic of interest, Locate archival data on sample regarding topic of interest, Compare data.
BLocate archival data on sample regarding topic of interest, Collect current data on topic of interest, Compare data, Select current sample.
C Compare data, Select current sample, Collect current data on topic of interest, Interview sample about past recollections concerning topic of interest.
D select current sample, Interview sample about past recollections concerning topic of interest, Correct current data on topic of interest, Compare data.
