This Is A Tricky Domain Because, Unlike

An Ethicist Is Somebody Who Sees Something Wrong With Whatever You Have In Mind.

You Don't Understand Anything Until You Learn It More Than One Way.

It Makes No Sense To Seek A Single Best Way To Represent Knowledge-because Each Particular Form Of Expression Also Brings Its Particular Limitations. For Example, Logic-based Systems Are Very Precise, But They Make It Hard To Do Reasoning With Analogies. Similarly, Statistical Systems Are Useful For Making Predictions, But Do Not Serve Well To Represent The Reasons Why Those Predictions Are Sometimes Correct.

When David Marr At Mit Moved Into Computer Vision, He Generated A Lot Of Excitement, But He Hit Up Against The Problem Of Knowledge Representation; He Had No Good Representations For Knowledge In His Vision Systems.

I Believed In Realism, As Summarized By John Mccarthy's Comment To The Effect That If We Worked Really Hard, We'd Have An Intelligent System In From Four To Four Hundred Years.