Experts may or may not know how they get the results
Use of experts time consuming, expensive
Some variation on conclusions of different experts
Continuity of expert knowledge threatened by retirement, etc.
Training of new experts largely by apprenticeship (time consuming, expensive, unreliable)
While no follow-up studies of student performance for given placement,
changes based on placement tests were analyzed to discover the
faculty were at least as effective
Data Incomplete and Inconsistent
Different measures may suggest conflicting conclusions (e.g., ACT, ACT)
