&gt;  to add funtional programming, hook and fork, easier tacit programming and fix certain other issues that even Ken Iverson himself acknowledged<p>Whitney and Iverson disagreed about a lot of these things - e.g. Whitney prefers scan and fold to go left-to-right, rather than Iverson&#x27;s right-to-left. Iverson is consistent with the rest of the language, Whitney is not (though much more practical). Also, Iverson added hook and fork; Whitney preferred the much simpler multi-monadic or dyadic-multi-monadic juxtaposition.<p>I don&#x27;t remember where I read this, but I do remember reading Iverson conceding that Whitney&#x27;s practical approach is probably a better idea than his own pure approach.