Did you see what I saw?
The first cornerstone of good integrated pest management (IPM) is the use of scouting for pests. Whether we are talking mice, weeds or even flies it is very important to determine just what you have and how many. By doing this on a routine basis you can measure how effective your pest control program is running. Without scouting, you are running like a car down the road without a speedometer. You know you are moving - but you don't know how fast.
When making a change to a pest control program, be sure to scout after allowing the program change to fully run. This change then will be measured against past performance. If done on a routine basis scouting will map your progress through time with hopefully good results.