Describe the internal and external criticism that is used to evaluate middle range theories

Making judgement as to whether a theory could be adapted for use in research is very important.  Describe the internal and external criticism that is used to evaluate middle range theories.
this is a discussion post
needs to be in: APA 7th edition
400 words with 2 references
less than 10 % plagiarism
please i also need 2 discussion replies with citations. thanks