1. Democratic validity
The research can be said as valid if the research includes the participants to give their opinions, ideas and comments about the implication of
the research. It can be fulfilled by having interviews and observations with the collaborators as well as the participants. The discussion will be done during the
research. The democratic validity in this research was gained from the interviews with the collaborators and the students of IV B.
2. Outcome Validity
Outcome validity is related to the results of the actions research. The research could have outcome validity when it was successful. If there were
significant improvements during the actions implemented from the beginning to the end which matched the intended purposes of the research, it can be said
that the research is successful. The outcome validity in this research deals with the improvements of the vocabulary mastery of the students by using Wall
Charts.
3. Process validity
The process validity is related to process of conducting the research. The actions done in the research should be believable. To gain the process
validity, the researcher will collect the data by doing classroom observations, students and teacher interviews, and field notes. In addition, there were some
evidences to support the data such as photographs and notes.
4. Catalytic validity
Catalytic validity concerns with how the research leads the participants to better understanding and takes further actions or changes. The research
allows all the participants to deepen their understanding of the social realities of the context. This validity was accomplished as there were some positive
changes after the implementation of the actions.
5. Dialogic validity
The dialogic validity is related to the process of peer reviews in the action research. The researcher can fulfill the dialogic validity by discussing
the research findings with the collaborator. Any useful suggestion to improve the quality of the actions of the research should be considered.
The five criteria above were used in this research. Besides that, the researcher used Pearson correlation to test the validity of the instrument in this
research. The Pearson’s product moment correlation showed if the correlation
between each question items were significant. An instrument was said as valid if the r
pearson
was bigger than the r
table
r
pearson
r
table
. The invalid questions in the instrument will be eliminated by the researcher. The data obtained were analyzed
using the SPSS 16 computer program. The following table is the table of critical values for Pearson correlation the r
table
. There were 30 participants in this research, so the r
table
used is 0.361 from the 5 significant level.
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