sentences:  With the advent of more sophisticated analyzers, this concept known as Process Analytics become much more prevalent in the 1980s and a new discipline called Process Analytical Chemistry (PAC) emerged which combined chemical engineering and analytical chemistry.One of the main driving forces for PAC (See also a more recent but related development in the pharmaceutical industry, called PAT) is to remove the bottleneck, and time lag, associated with sending the samples to the lab and waiting for the analysis results.By moving the analysis to the process, results can be obtained closer to real-time which effectively improves the ability for the control action to correct for process changes (i.e.