We are drawing many samples at regular intervals from our bottling process that has been previously brought $\text{'}$in statistical control'. The most current sample point happens to falls outside the upper control limit $(+-3$ sigma$).$ Should we:

Stop sampling, stop the process, and search for a special cause?

Just suspend sampling for a while and give the process a chance to re$-$set itself?

Continue with the sampling of the running process and wait to see if another sample point falls out of control? Just one out of control point in a regular sampling process signifies very little $-$ there is a high probability of an individual sample point falling out of the $+-3$ sigma control limits just by chance. seeing that we are sampling regularly.

Continue with the sampling $-$ it's just a random common cause driven event that we cannot anticipate or control well.