Pretest and protest research design is an evolved version of posttest design. This design deal with issues of biasness arises due to allocation of respondents in to groups. In the Pretest and protest experimental research design influence independent variable over dependent variable determined. In Pretest and protest experimental research design total sample divided in to two parts, one part is experimental group and other is control group. In the study experimental group got introduced with variable whereas other control group remains intact. Under the research pre test and post test results for both the groups were compared. The difference between result of both the groups known as finding of the study. Process to carry research in to test hypothesis is as follow:
Both of the sampled groups randomly assigned with the topic. After assignment of topic pretest is being carried out. One needs to ensure that except introduction of independent variable in treatment no other changes need to happen in both the groups. All conditions under which test is being carried out need to be similar for both the groups. After completion of this phase posttest also being carried out and differences of pretest and posttest for both the groups examined separately. Changes happened in both the groups compared and analyzed.
Pretest and post method can also be viewed as mixed or split plot design when used in mixed factorial design. Split design is grouping of fully-crossed factorial and with-in subject design.
Solomon Four-Group design – we can adapt to this design from simple pretest and posttest design by dividing the sample in four groups instead of two groups. Out of four groups two groups are experiment and two groups treated as control groups. In this design one experimental and one control group does receive any pretest. This design is better because it can control pretest effects.
K. S. Bordens and B. B. Abbott. (2008). Research design and methods: a process approach. New York: McGraw-Hill.