Identity has for long been an important concept in philosophy and logic. Plato in his Sophist puts same among those fonns which "run through" all others. The scholastics inherited the idea (and the tenninology), classifying same as one of the "transcendentals," i.e. as running through all the categories. The work of Locke and l.eibniz made the concept a problematic one. But it is rather recently, i.e. since the importance of Frege has been generally recognized, that there has been a keen interest in the notion, fonnulated by him, of a criterion of identity. This, at first sight harmless as well as useful, has proved to be like a charge of dynamite. The seed had indeed been sown long ago, by Euclid. In Book V of his Elements he first gives a useless defmition of a ratio: "A ratio is a sort of relation between two magnitudes in respect of muchness." But then, in definition 5 he answers, not the question "What is a ratio?" but rather ''What is it for magnitudes to be in the same ratio?" and this is the definition that does the work.

Identity has for long been an important concept in philosophy and logic. Plato in his Sophist puts same among those fonns which "run through" all others. The scholastics inherited the idea (and the tenninology), classifying same as one of the "transcendentals," i.e. as running through all the categories. The work of Locke and l.eibniz made the concept a problematic one. But it is rather recently, i.e. since the importance of Frege has been generally recognized, that there has been a keen interest in the notion, fonnulated by him, of a criterion of identity. This, at first sight harmless as well as useful, has proved to be like a charge of dynamite. The seed had indeed been sown long ago, by Euclid. In Book V of his Elements he first gives a useless defmition of a ratio: "A ratio is a sort of relation between two magnitudes in respect of muchness." But then, in definition 5 he answers, not the question "What is a ratio?" but rather ''What is it for magnitudes to be in the same ratio?" and this is the definition that does the work.

If asked what Humeanism could mean today, there is no other philosopher to turn to whose work covers such a wide range of topics from a unified Humean perspective as that of David Lewis. The core of Lewis's many contributions to philosophy, including his work in philosophical ontology, intensional logic and semantics, probability and decision theory, topics within philosophy of science as well as a distinguished philosophy of mind, can be understood as the development of philosophical position that is centered around his conception of Humean supervenience. If we accept the thesis that it is physical science and not philosophical reasoning that will eventually arrive at the basic constituents of all matter pertaining to our world, then Humean supervenience is the assumption that all truths about our world will supervene on the class of physical truths in the following sense: There are no truths in any compartment of our world that cannot be accounted for in terms of differences and similarities among those properties and external space-time relations that are fundamental to our world according to physical science.

Discussing the Undiscussable

Since his 1990 landmark book Overcoming Organizational Defenses, Chris Argyris has extensively researched and written about how well-meaning, smart people create vicious cycles of defensive behavior to protect themselves from embarrassment and threat. In Discussing the Undiscussable, Bill Noonan enlivens the scholarly work of Chris Argyris through the use of reflective exercises and easy-to-read chapters that illuminate the basic human experience endemic to the creation of defensive routines. This book offers hope for altering organizational defensive routines by leveraging the greatest opportunity for change--the way we think and act.

Discussing the Undiscussable provides a set of practical "how to do" exercises for detecting, surfacing, and discussing organizational defensive routines in a safe and productive way. The combination of text, business fable, and interactive and reflective exercises is versatile in its application to both individuals and groups. The companion DVD contains video vignettes of the book's business fable where the actors model both defensive routines and virtuous cycles of behavior. Readers will instantly recognize what has long been going on in the workplace, and will be able to develop the skills to talk about it productively.

Praise for Discussing the Undiscussable

"I highly recommend this book to leaders, consultants, and anyone else who wants to help teams and organizations learn to address their most challenging issues. Bill Noonan's insights, stories, and practical methods make this an important book to read."
--Roger Schwarz, author, The Skilled Facilitator, and coauthor, The Skilled Facilitator Fieldbook

"Noonan makes Chris Argyris's pathbreaking work on organizational defensive routines accessible, and even entertaining."
--Bruce Patton, coauthor, Getting to YES and Difficult Conversations

"Whether at work or home we can use Bill Noonan's work to improve our lives and those of the people we interact with."
--Robb E. Van Cleave, treasurer, International Board of Directors, Society for Human Resources Management (SHRM)

"In a world of increasing complexity where multiple perspectives are required for addressing work issues, the ability to guide groups in having honest discussions where both intuition and data are given full and fair consideration is more and more important."
--Ralph Biggadike, professor, management division, Columbia Business School