1.   At one extreme lie true experimental procedures, which demand a high degree of control over possible confounding factors.

2.   Not uncommonly there have been problems in replicating both experimental procedures and the results claimed for them.

3.   So far, research has centered on two highly experimental surgical procedures.

4.   An experimental procedure for patients suffering from leukemia.

5.   The gold standard for accurate experimental procedures is the double-blind medication trial.

6.   Two further mandatory modules are taken, covering mathematics and experimental procedures.

7.   An experimental procedure to cure sickle cell anemia appears to have eliminated all traces of the disease from a suburban Atlanta boy.

8.   All were critically ill and the experimental procedure was undertaken as a last resort because medically compatible marrow donors could not be found for them.

9.   But it is what happens to Getty after he leaves the hospital Thursday that will determine if the experimental procedure can buy time in the battle against AIDS.