'''Refactoring''' is the process of changing the structure (or design) of code without changing the function.  See these interesting references for discussions about refactoring.

http://www.refactoring.com/

http://www.wikipedia.org/wiki/Refactor

http://ootips.org/refactoring.html

http://www.exciton.cs.rice.edu/comp410/books/refactoring.html

http://emw.inf.tu-dresden.de/de/pdai/Forschung/refactoring/refactoring_html/node26.html

----

'''Packages'''

One common approach for refactoring Tcl code is to repackage groups of functions into namespaces and packages.  This modularization can improve the code maintainability, and it is very easy to do.  See [How to build good packages], and the cannonical reference by Will Duquette http://www.wjduquette.com/tcl/namespaces.html

----

'''Tools'''

[ActiveState]'s Komodo and Red Hat's Source Navigator (see [http://www.redhat.com/software/gnupro/technical/gnupro_sn.html] and [http://sourcenav.sourceforge.net/])both have project browsing capability for Tcl, although they aren't specifically for refactoring.