The purposes of this research were to examine the internal and external validation of web-based learning environment model to enhance cognitive skills and critical thinking for undergraduate students. The target groupfor the internal validation consisted of 4 experts. The target group for the external validation consisted of 45 students studying in Science for Quality of Life subject in Udon Thani Rajabhat University. The Research Developmental Phase II: Model validation was employed in this

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... dy. The results from the model validation are revealed as follows. Firstly, the internal validation, the model had been examined by 4 experts and it was found that the model design is consistent with underlined theories based on Instruction Design theories (ID Theories). Secondly, the external validation, it exposed that the students learning with model had high levels of cognitive skills and critical thinking and achievements. The average scores of cognitive skills and critical thinking test were in the higher level.The learning achievement of students passed the criteria of 80 percent.The students'opinion showed that the learning contents, the media on the network and the design were suitable for supporting knowledge construction and the model can enhance students' cognitive skills and critical thinking.