Being systematic means that you have a plan and a method for the search you are about to engage in. That plan should be briefed to all officers involved in the search and it will be important that you do not deviate from the plan. In my opinion, part of that plan must cover a clear starting point as well as a clear ending point for the search. Everything in between those points must then be thoroughly searched. Nothing should be skipped over.
For example, officers determine that they are going to search four residential properties looking for a suspect. After completing a very thorough search of the first two properties, they find that the third property has a very angry dog in the rear yard. It is three o'clock in the morning and you can clear most of the yard by looking over the fence. It would be easy to skip this yard and not wake up the owner in the middle of the night. After all, we can see most of the yard. Don't do it.
Knock on that door, have the owner take the dog inside, and search that yard. Criminals have been quoted as saying, "cops don't search yards with a dog." And that is why they hide there. Fortunately, many cops do search those yards and they locate lots of suspects. Some of those suspects are actually found inside the dog house.
One tool that is required for any search, day or night, indoors or out, is a flashlight. The value of a flashlight during darkness is pretty obvious, but I believe it is just as vital during daylight. You never know where a search may take you. You can be outside in the bright sun one minute and looking into a closet or attic the next minute. In addition, the flashlight helps eliminate shadows under stairwells, under vehicles, and in tight spaces. "Hiding in the shadows" is a real occurrence with suspects, and those shadows can sometimes play tricks on our eyes.
I have participated in many successful searches and few that were not so successful. I am convinced that the three traits we have discussed have contributed greatly to those successes. I am also convinced that the lack of being thorough, patient, and systematic has led to missing suspects and putting officers at risk.