Okay, let us first fill in the gap in the question above. Note that the capitalized word is the missing word to be filled in to the gap.
"The use of ANALOGY refers to the process of finding similar structures between two problems and thus finding similarities between their solutions."
When one compares two things or situations that are different in order to show or explain some similarities between the situations or things, the concept is known as Analogical reasoning that is the use of analogies. One must know that metaphor is not an analogy but it is an important tool used in analogy.
