ABSTRACT
INTRODUCTION This chapter is intended to assist the reader in developing an understanding of current thinking regarding environmental monitoring and control and its application in aseptic processing. Some background historical information will be discussed to describe the journey from where we came and where we are in an effort to appreciate the nuances of the journey forward. Of course it is our present situation that dictates how we function on a day to day basis and it is the vision of where we want to be that drives our thoughts and processes through the challenges presented by continual change.
