Question: Wikipedia says Miller columns "resemble" something used earlier in Smalltalk and was independently invented by Miller. Who was first - Smalltalk or Miller?

If Smalltalk was first, then who exactly invented Miller columns and why Miller columns are Miller Columns, not X columns, where X is last name of the inventor?

If Miller was first, why Smalltalk is mentioned?

Answer: 
The Smalltalk mechanism being referenced was the class hierarchy browser. It was invented in 1976 by Larry Tesler (see Alan Kay "The Early History of Smalltalk" under "Smalltalk-76"). The browser used a fixed 4-list view to locate source code for methods. The first list was for categories. Within each category you could select a class in the second list. Once a class was selected, a method protocol could be selected from the third list. Finally, once a method protocol was selected, a method could be selected from the fourth list. Upon selecting a method, the source code for the method appeared in the text editor below the 4 lists. This is an example of a special-purpose fixed-depth miller column.

From my reading of the wikipedia article, it seems that Miller columns were more general and had an arbitrary number of columns. It's believable that Miller had no knowledge of the Smalltalk browser - the browser wasn't made generally available until the public release of Smalltalk-80 in 1983. Before then, it was only used by people associated with Xerox and by a handful of companies that were asked to port Smalltalk-80 to their own hardware. (See Smalltalk - Bits of History and Words of Advice). Screenshots of a class hierarchy browser did appear in the 1981 issue of Byte magazine (page 124 onward) but again, this was after the 1980 invention of Miller columns.

It makes sense, then, that the more general mechanism was named after Miller with people afterwards noticing similarities to the Smalltalk browser.
Miller Columns are closely related to techniques used earlier in the Smalltalk browser, they were invented by Mark S. Miller, though at Yale University in 1980. Refer to the following url
for more information

[Miller Columns](http://appuntitech.blogspot.in/2013/01/miller-columns.html)