3. TYPES
There are two types or pre experimental
design. They are as follows:
1. ONE SHOT CASE DESIGN.
2. ONE GROUP PRE TEST POST TEST
DESIGN.
4. ONE SHOT CASE DESIGN
• In this design, a single experimental group is
exposed to a treatment and observations
are made after the implementation of that
treatment.
• There is no random assignment of the
subjects to the experimental group.
• There is no control group.
6. ONE GROUP PRE TEST-POST
TEST DESIGN
• Is the simplest type of pre experimental
design, where only the experimental
group is selected as the study subjects.
• A pre test observation of the dependent
variable is made prior to the
implementation of the treatment to the
selected group.
7. • Afterwards the treatment is
administered, and finally a post test
observation of dependent variable is
carried out to assess the effect or
treatment on the group.
• This design measures the effect of
intervention before (pre test) and after
the experiment (post test).
• There is no control group in this design.
8. GROUP PRE TEST – POST TEST
DESIGN
EXP GROUP TREATMENT POST TEST
PRE TEST
9. ADVANTAGES
• Is a very simple & convenient
design that helps the researcher to
conduct studies in natural settings.
• It is most suitable for beginners
10. DIS ADVANTAGES
• Is considered very weak experimental design
to establish causal relationship between
independent & dependent variables because it
controls no threat to internal validity.
• It has a higher threat to internal validity of
research.
• May have selection bias, which is a very
serious threat.