5 Skandhas / 5 aggregates My question is what is the action each of the 5 aggregates perform. If I was not clear about the question please drop me a message here I will try to be much clearer. Please provide a Sutta as a reference.
"And why do you call it 'form'? Because it is afflicted, thus it is
  called 'form.' Afflicted with what? With cold &amp; heat &amp; hunger &amp;
  thirst, with the touch of flies, mosquitoes, wind, sun, &amp; reptiles.
  Because it is afflicted, it is called form.
  
  "And why do you call it 'feeling'? Because it feels, thus it is called
  'feeling.' What does it feel? It feels pleasure, it feels pain, it
  feels neither-pleasure-nor-pain. Because it feels, it is called
  feeling.
  
  "And why do you call it 'perception'? Because it perceives, thus it is
  called 'perception.' What does it perceive? It perceives blue, it
  perceives yellow, it perceives red, it perceives white. Because it
  perceives, it is called perception.
  
  "And why do you call them 'fabrications'? Because they fabricate
  fabricated things, thus they are called 'fabrications.' What do they
  fabricate as a fabricated thing? For the sake of form-ness, they
  fabricate form as a fabricated thing. For the sake of feeling-ness,
  they fabricate feeling as a fabricated thing. For the sake of
  perception-hood... For the sake of fabrication-hood... For the sake of
  consciousness-hood, they fabricate consciousness as a fabricated
  thing. Because they fabricate fabricated things, they are called
  fabrications. 
  
  "And why do you call it 'consciousness'? Because it cognizes, thus it
  is called consciousness. What does it cognize? It cognizes what is
  sour, bitter, pungent, sweet, alkaline, non-alkaline, salty, &amp;
  unsalty. Because it cognizes, it is called consciousness.
  
  https://www.accesstoinsight.org/tipitaka/sn/sn22/sn22.079.than.html


My comments: 


I think the description of 'perception' above is to highlight the perception of 'difference', 'contrast', etc. Thus, it could include shapes, length, sound frequencies, texture, sensations, etc. 
The meaning of 'sankhara' above is question in itself. However, the key term is 'abhisaṅkharonti' ('fabricate'; a verb), which generally refers to 'attachment' in the suttas (eg. SN 12.51) and is also used in suttas about 'kamma' (eg. SN 12.25). Therefore, the description of 'sankhara' above appears to refer to 'mentally constructing' ('abhisaṅkharonti') each of the aggregates as 'self' and 'pertaining or belonging to self'. It appears to mean 'mental constructing' ('abhisaṅkharonti') each of the aggregates into something much more than they actually are. For example, SN 12.2 refers to 'producing' (abhinibbatti) views of 'beings' (sattānaṃ) in respect to the 'appearance or manifestation of the aggregates' (khandhānaṃ pātubhāvo). 
The description of 'consciousness' above &amp; below, in terms of both 'tastes' (above) and 'feelings' (below) appears to highlight consciousness as a 'sensory impact'. 



  'It cognizes, it cognizes': Thus, friend, it is said to be
  'consciousness.' And what does it cognize? It cognizes 'pleasant.' It
  cognizes 'painful.' It cognizes 'neither painful nor pleasant.' 'It
  cognizes, it cognizes': Thus it is said to be 'consciousness.'
  
  Discernment (wisdom) &amp; consciousness are conjoined, friend, not
  disjoined. It's not possible, having separated them one from the
  other, to delineate the difference between them. For what one
  discerns, that one cognizes. What one cognizes, that one discerns. 
  
  https://www.accesstoinsight.org/tipitaka/mn/mn.043.than.html





  'The six classes of contact should be known.' Thus was it said. In
  reference to what was it said? Dependent on the eye &amp; forms there
  arises consciousness at the eye. The meeting of the three is contact.
  Dependent on the ear &amp; sounds there arises consciousness at the ear.
  The meeting of the three is contact. Dependent on the nose &amp; aromas
  there arises consciousness at the nose. The meeting of the three is
  contact. Dependent on the tongue &amp; flavors there arises consciousness
  at the tongue. The meeting of the three is contact. Dependent on the
  body &amp; tactile sensations there arises consciousness at the body. The
  meeting of the three is contact. Dependent on the intellect &amp; ideas
  there arises consciousness at the intellect. The meeting of the three
  is contact. 'The six classes of contact should be known.' 
  
  https://www.accesstoinsight.org/tipitaka/mn/mn.148.than.html





  At Savatthi... There are these four nutriments for the maintenance of
  beings who have come into being or for the support of those in search
  of a place to be born. Which four? Physical food, gross or refined;
  contact as the second, intellectual intention the third, and
  consciousness the fourth. These are the four nutriments for the
  maintenance of beings who have come into being or for the support of
  those in search of a place to be born.
  
  https://www.accesstoinsight.org/tipitaka/sn/sn12/sn12.063.than.html