# Same name for all appendices

I have a problem with Appendices. I include them all in one big file. Here I include chapters and after including chapters, I include appendices as follows:

\begin{appendices}
\include{appendixA}
\clearpage{\pagestyle{empty}\cleardoublepage}
\include{appendixB}
\clearpage{\pagestyle{empty}\cleardoublepage}
\include{appendixC}
\clearpage{\pagestyle{empty}\cleardoublepage}
\end{appendices}


at the beginning of a file appendixA I have:

\appendix
\chapter{Computation of thickness}
\label{sec:ComputationOfThickness}
bla bla bla
at the beginning of file appendixB I have:
\appendix
\chapter{Computation of surface tension of glass}
\label{sec:ComputationOfSurfaceTensionOfGlass}
%\addcontentsline{toc}{chapter}{Computation of surface tension of glass}
bla bla bla


the problem is that in the whole file, all appendices are labeled as A and not A, B and C.

Could you tell me, where I have a mistake? The numbering is working very well for all chapter I have in the previous text, but once I change into appendices it stops and all is numbered as A.

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Welcome to TeX.sx! A tip: If you indent lines by 4 spaces, then they are marked as a code sample. You can also highlight the code and click the "code" button (with "{}" on it). –  egreg Jul 22 '11 at 9:57

Since you are using the appendices environment (of memoir class or of the appendix package), no \appendix command is required.
Without the environment, only one \appendix command must be issued.