I want to extend theory of planned behavior, kindly recommend me some new variables that has been not investigated before. Check the attached model, want to extend model mentioned in picture.
See the 'limitations' section of this wikipedia page and check out its references. You'd find missing parts and you could add proper parameters respectively: https://en.m.wikipedia.org/wiki/Theory_of_planned_behavior#:~:targetText=In%20psychology%2C%20the%20theory%20of,individual's%20behavioral%20intentions%20and%20behaviors.
It is always good to start with reading the already developed theories and of course TPB can be an excellent starting point. But in order to find out new factors you need to already know enough about what is there and where are the potentials. I suggest you to read this paper, titled : Encouraging pro-environmental behaviour: An integrative review and research agenda
Not sure whether you are interested in the area of households or workplace, but we did emprical research in Pro environmental behaviour in which we rejected some usual suspect variables and introduced new ones. see attach and under my projects PEB vor more.
Extended TPB or Modified TPB can be adapted to capture the phenomenon of Green behavior as per the literature gap in your local/regional context in order to provide a novelty approach of your prospect work viz. environmental concern, environmental knowledge, etc.
You can use green purchase behavior which is also affected by subjective norms, attitudes,
perceived behavioral control as well.
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