What does the Tanaka-Johnson and Moyers analysis of mixed dentition involve?

The Tanaka-Johnson and Moyers analyses are mixed dentition space analysis methods used to PREDICT (not measure) the combined mesiodistal widths of the unerupted permanent canines and premolars based on the widths of mandibular permanent incisors. This helps determine if there will be adequate arch space. A is wrong — eruption timing is a separate topic. C is wrong — these analyses don't assess primary tooth growth. D is wrong — occlusal relationships in primary dentition are evaluated separately.