John Bengson & Terence Cuneo 
Philosophical Methodology [PDF ebook] 
From Data to Theory

Philosophical Methodology is a book addressed to the entire philosophical community. It develops a novel account of the structure and goals of inquiry, offers the first systematic discussion of philosophical data, and assesses extant philosophical methods. Introducing a new method for doing philosophy, it positions theorists to better understand their topics while also revealing how philosophy can continue to make progress in answering its foremost questions.