abstract ;;Quote: the message/object model explicitly maintains the type of an object and the operators for a class; no need for memorization

2 ;;Quote: to call a function, a programmer gives its name, assumes an implementation, and uses arguments of the correct type

2 ;;Quote: a built-in operation uses the correct data type automatically

4 ;;Quote: in computing, restricted data types are assumed; e.g., text editors do not work on binary files

5 ;;Quote: in the message/object model, objects have a class which implements such operations as 'compare'; a sort operation could use this for any type

6 ;;Quote: while dogs inherit characteristics from mammals, the definition of mammals is partly from dogs

7 ;;Quote: complete source listings for Smalltalk is only four inches thick; perhaps due to inheritance

9 ;;Quote: printing could be projecting an object across the memory-to-printer barrier, or editing across a memory-to-user barrier

10 ;;Quote: Smalltalk names objects within a private address space while Unix uses a shared file system; Unix has many more organizational productivity tools