The value can be asses using scientific thinking.

Firstly by using empiricism, one can uses what he thinks and feels uses his five senses. When one uses his five senses, he can dissect what is he exactly thinking and that he will learn to value friendship with feelings.

Secondly by using rationalism, one can use logic on who is right and wrong friend to make. One can have the ability to be sure of what exactly are the friends he want to mix around with. Therefore, allowing him to make the right decision to choose the right friends.

Lastly, scepticism. One can use devil advocacy to apply on friendship. By allowing one to choose between the rate of making a friend where it will lead and therefore assess the value of the friendship.

Therefore when one uses scientific thinking when assessing the value of friendship, one can learn to value the right friends with the right values.