Ceci est une ancienne révision du document !
— section: Macro programming subsection: LaTeX macro programming permalink: /FAQ-latexqual date: 2014-06-10 —
# The quality of your LaTeX
The [`l2tabu`](https://ctan.org/pkg/l2tabu) tutorial (mentioned in [online introductions](/FAQ-man-latex)) is undoubtedly a good read.
However, it's always difficult to remember the things you should _not_ do, when there are so many things to remember that you really must do: some automation is useful….
The nicely-named [`nag`](https://ctan.org/pkg/nag) allows you to apply a configurable set of checks to your document, as you run it through LaTeX; you get messages like: ```latex Package nag Warning: Command \bf is an old LaTeX 2.09 command. (nag) Use \bfseries or \textbf instead on input line 30. ```
(the package provides a demo file which contains most of the sorts of errors you might make — the example is one of them).
While [`l2tabu`](https://ctan.org/pkg/l2tabu) and [`nag`](https://ctan.org/pkg/nag) alert you to _possible_
programming errors, you should not forget that they are merely
commenting on _style_; don't assume that a [`nag`](https://ctan.org/pkg/nag) error is
going to damn your code — rather, note the issue and try to train
your fingers not to do the same
The `lacheck` program analyses your source and comments on
it; its view of what is
bad is _very_ subjective (the
documentation says), but it can be useful.