1 Next add your ingredients: the compost and kelp or molasses. 2  Let the tea brew for about 24 hours. 3  Make sure the opening to the air pump is distributed evenly (cheapest is an air stone) and secured to the bottom, so it does not get pushed to the top overnight. 4  This will keep the tea sufficiently aerobic.
One example of a technical control is data encryption. Other examples are network intrusion detection systems, passwords, firewalls and access control lists. Continue Reading. Technical controls secure computing system and information access through strategically designed software and hardware.
After you identify and remove the assignable cause(s), collect additional data and recalculate the mean and control limits. Observe the control chart to confirm it is in statistical control. Continue plotting new data but do not recalculate the control limits. If the process does not change, the limits should not change. If you make changes to the process, recalculate the control limits to observe shifts in variation after the change. For example, imagine youâre interested in improving monthly customer satisfaction scores. You collect scores from August to November 2009 and plot the data in time series using an I-chart. The chart measures the process mean, and the control limits are calculated: