Dear all,

the following example :
...
\chapter{Blabla}
\subsection{bla}
...
 is  numbered

1 Blabla
11 bla

The problem appears only if I "skip" the \section step.
In fact

\chapter{Blabla}
\section{Bla}
\subsection{bla}

gives

1 Blabla
1.1 Bla
1.1.1 bla


Is the first example the expected behavior ?
I would better have think to something like
1 Blabla
1.0.1 bla