1. Use DT when it is clear-cut and representative.	2. Use PT only when DT is not clear-cut/representative, and PT is. Often happens with Shear DT estimates (Shear DT often too high). Remember that the Data T is often calculated, so it may be unrealistic.	3. Use MET only when PT and DT are not clear-cut and representative. Thumb-rule: PT is NOT clear cut when you have difficulty distinguishing amongst three different PT pictograms along the horizontal.  Example: on Vis PT diagram, you honestly have difficulty telling the difference between an A4.0, A5.0, and A6.0
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