The Elaboration Likelihood Model (ELM) has been introduced in marketing researches for describing advertising persuasion since the 1980s. ELM defined that there are variables that resolve people’s emotion and have the effect on his or her evaluation. This study will apply the flexible correction to examine how the contrast degrees between subjective knowledge and objective knowledge affect attitude confidence and judgmental correction.
In the present research, we define high involvement in all our participants and manipulate participants into two major groups. Half of the participants will be served as high subjective knowledge with low objective knowledge, and the remaining participants will be served as low subjective knowledge with high objective knowledge. The participants in this experiment are Thai people, and we collected the data from an online survey. The results of these analyses showed that participants with low subjective knowledge have more correction on attractive endorser than participants with high subjective knowledge. The attractive endorser has more effect when participants are served as a high subjective knowledge.
Key words: elaboration likelihood Model, flexible correction model, bias correction, subjective knowledge, objective knowledge, judgmental attitude, evaluation.

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