5 model of emotion

I read the first part of the book ``What is an Emotion''. It mentions five differnt view and research area in the emotion due to the personal phylosophy. They are

• Considering emotions and metal phenomena are different. (distinguish their differnce)
  
• Grouping emtions into generic type. (classification)
  
• Using the physiological changes to detect emotional changes. (Dominant now, using the physiology)
  
• Role of emotion. (Social effect of emotion, person to person effect, etc. )
  
• Analyzing emotion into its components or aspects.
  

Because of the differnt phylosophys, there are diffent theories, such as sensation theories, physiological theories, behavioral theories, evaluative theories, and cognitive theories.