Answer:
Control Series Design
Step-by-step explanation:
The study replaces numerical "controls" in a quasi-experimental model for the lack of physical control of the experimental situation.
The most popular quasi-experimental design is the pre-test/post-test model of the Comparison Group.
This model is the same as the traditional controlled experimental design except that either the experimental group or the control group can not be randomly assigned to the participants, or the investigator can not monitor which group should receive the treatment.
In certain terms, not all participants have the same chance to be in the control or the test classes, or to receive or not receive the treatment.