Hello, 

After reading bulk of good quality papers in the field of RE when I have tried to make a survey of approaches followed by the authors I come to a conclusion that if we  broadly classify all of them they all directly or indirectly reaching to the classification boundary of

1. manually(checklist based, scenario based, questionnaires, etc- are these goal oriented?)

2. knowledge based(ontology, - are these Aspect-Oriented?)

3. machine learning(supervised, unsupervised, - are these pattern based ?) 

Am I correct? or still WE can make it more in-depth tree structure like.. Please provide depth knowledge for this.

Hopefully waiting for reply....

Thanks 

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