The first critical variable is how children are chosen for a program.

The critical variable here is whether a potential terrorist would be intimidated by the security in place.

Other critical variables are the time of day and how often the child is left alone.

The greatest and most critical variable is the time the fish should stay in the smoker.

But no matter how much they practice, the pilots cannot control one critical variable, the weather.

Finally, as in civil production, the critical variables will be the what and the how.

The critical variable is speed, because so many of the environmental and safety improvements are dependent upon it.

Racial and religious composition, however, seems to be a critical variable.

The commitment of the Bush administration is a critical variable.

Another critical variable is the purity of the water used.