I mean which model or theory that appropriate for measuring the effectiveness? what are the best variables or factors for that?
This study is quantitate method
https://javascript.plainenglish.io/how-to-measure-and-optimize-the-performance-of-a-web-app-52beb20aabba?gi=b109c82eea0
It depends on the viewpoint that you want to use in your application. Each web application designed for specific information and regarding to your objectives.
There are many model for succes evaluation . You can use of of them. I suggest you TAM or The D&M succes model. You can also use statics of your site. Such as number of visits, clicks, …
It depends on your point of view. TAM is an excellent model to use
Depending on your perspective on the application but the best model In supporting it Is D&M
Depending on your perspective you can use Page Load, Render Time, Server Time, Speed Index and Many others.
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