Answer:
Reliability
Step-by-step explanation:
Systematic observation is an objective method of observation that states what is to be observed and the attribute to be observed and how to be recorded. This is to ensure that, if there are more than one observer, they will all be observing the same attribute or behavior. In reliability, the level of agreement is determined by two or more observers: in which, the higher the agreement between the observers, the more reliable it is.