The objective of this research is to find out the effect of Personality (extravert vs introvert)
and knowledge about ecosystem on students’ environmentally sound behavior. An ex
post facto method has been used by selecting 8 samples for each cell. Reliability of
personality instrument was .964, knowledge was .937 and students’ environmental
behavior was .95. Data Analyzed by two-way ANOVA. Research results revealed that
there was significant difference of students’ environmental behavior between extravert
personality and introvert, moreover, between high and low knowledge about ecosystem.
Moreover, there was a significant interaction effect between personality and knowledge
about ecosystem students on environmental behavior. It could be concluded that
extravert personality is not always good for students in becoming them to be more
positive behavior, but introvert personality was good as well. It means that it mostly
depends also on students’ knowledge about ecosystem.
KEYWORDS:environmentally sound behavior , personality, knowledge about ecosystem