Waiting until a problem is observable .
Clinicians often use screening tools only after they've noticed a problem.
If the problem is obvious, referring may be the best response. Screening such children may compound rather than reduce the error in both clinical judgment and screening tools. Ignoring screening results . Many times, screening test results are not taken seriously and children who fail are not referred but rather viewed with a wait and see attitude. Good screens are right 70 to 80 per cent of the time.