TEM Journal. Volume 8, Issue 4, Pages 1499-1507, ISSN 2217-8309, DOI: 10.18421/TEM84-56, November 2019. TEM Journal – Volume 8 / Number 4 / 2019. 1499 Structural Equation Modeling of Teaching Behavior in Internet Use of Teachers in Thailand Paitoon Pimdee, Punnee Leekitchwatana Faculty of Industrial Education and Technology, King Mongkut’s Institute of Technology Ladkrabang (KMITL), Chalongkrung Rd., Ladkrabang, Bangkok, 10520, Thailand Abstract – At present, instruction via the internet is a challenge for teachers. Many teachers have changed their teaching behavior (TB) from a conventional style into a style of teaching via the internet. For this reason, this research had the objective to develop a structural equation model (SEM) of TB in internet use of lower secondary (LS) school teachers, classified according to school size. The developed SEM model of TB in internet use of LS school teachers had validity that was congruent to the empirical data of every model with good criteria of all goodness of fit indices. The model was composed of 8 latent variables from 24 observed variables. All causal variables in the model had a positive direct effect on TB in internet use, and these were able to explain the variation in TB in a large sized school, a very large sized school, and an extra-large sized school, with 99, 100, and 92, respectively. Keywords – Teaching Behavior, Internet Use, Secondary School, Teacher, Structural Equation Model. 1. Introduction The advancement of information technology has played an increasingly significant role in the way of life of people in society in all aspects of studying, working, and daily living. DOI: 10.18421/TEM84-56 https://dx.doi.org/10.18421/TEM84-56 Corresponding author: Paitoon Pimdee, Faculty of Industrial Education and Technology, Bangkok, Thailand Email: paitoon.pi@kmitl.ac.th Received: 17 July 2019. Revised: 08 October 2019. Accepted: 12 October 2019. Published: 30 November 2019. © 2019 Paitoon Pimdee, Punnee Leekitchwatana; published by UIKTEN. This work is licensed under the Creative Commons Attribution- NonCommercial-NoDerivs 3.0 License. The article is published with Open Access at www.temjournal.com Therefore, educational institutes at different levels have adjusted their pattern, of teaching, learning, and management in order to extensively utilize the advantages of information technology. Teachers need to adjust their pattern of teaching-learning by using increased information technology, [1],[2],[3] suggested that, for social media to be used as effective learning tools, and to adjust students’ prior affordances with these tools, complicated efforts in designing, scaffolding, and interacting with students during the process are necessary. Besides those who directly teach in the field of information technology/computers, those who teach other subjects need to adapt themselves to use the information technology/computers as well, particularly in using internet as media for teaching- learning management [4],[5],[6]. However, the teacher must be able to introduce internet use properly; this needs to have various supportive factors, in terms of internal factors, external factors, the background of the teacher, internal factors of the teacher, including different traits, and external factors of the teacher, covering numerous situations [7]. Particularly, school support and the background of teacher factor composing education and experiences would assist in teaching behavior (TB) in internet use; therefore this would provide complete benefits for learners [8], [9]. The internet would provide a more valuable advantage. Teachers of lower secondary (LS) schools are groups of teachers who play an important role in introducing the internet to benefit LS school students. These students have paid attention to, and have had a lot of contact with the internet, but they are still unable to effectively use it; schools and teachers still have the burden of and play a role to develop them to have appropriate behavior for internet usage. Moreover, the teacher is an essential person in helping them in this important task in order for them to accomplish targets. Currently, there is no clear evidence of which variables have an effect on TB in internet use, and whether it is a trait, a situation, or a background. Therefore, it is interesting to develop a SEM model