Allergies are the result of a hypersensitive immune system. The allergic immune system misidentifies an otherwise innocuous substance as harmful, and then attacks the substance with a ferocity far greater than required.
Laying off an employee is different from firing an employee. Firing means letting a worker go for any reason, whereas a layoff refers to an employment termination based on economics, usually involving more than one worker.
Measuring employee productivity is imperative to determine if the people you pay are earning their keep. Calculating productivity requires understanding the key indicators vital to any particular job position and establishing methods to track activity. This is easier for some types of positions than others.