How can i create 4 levels of sections

I'm trying to recreate the level system in these 2 images in my document I can't seem to create the one above because I don't know the command that created "Chapter 1"

I can't seem to create the one above because I don't know how to go beyond "subsubsection" so how is it possible to create a fourth level?

PS. I'm using \documentclass[]{article}

• How about using e.g. a book document class, which has chapters? – user121799 Jun 11 at 16:47
• @marmot can you show a small example of you recreating the above. because if it can then it might just be what im looking for – Zyzzx Jun 11 at 16:57
• \documentclass{book} \setcounter{secnumdepth}{3} \begin{document} \chapter{Introduction} \section{Introduction} \subsection{Background} \subsubsection{GUI} \end{document} – user121799 Jun 11 at 17:01
• @marmot I did not see your comment until I created my answer. – Dr. Manuel Kuehner Jun 11 at 17:04

For your next question, have a look at I've just been asked to write a minimal example, what is that?!

Solution 1

Changing the number of numbered levels (down to \paragraph).

\documentclass{article}
\setcounter{secnumdepth}{4}

\begin{document}
\section{section}
\subsection{subsection}
\subsubsection{subsubsection}
\paragraph{paragraph}
\end{document}


You may have a look at the titlesec package if you want to change the formatting of the \paragraph heading level.

Solution 2

Using a different document class (book) which provides an additional level (\chapter).

\documentclass{book}
\setcounter{secnumdepth}{4}

\begin{document}
\chapter{chapter}
\section{section}
\subsection{subsection}
\subsubsection{subsubsection}
\end{document}

• does this recreate the numbering system above? can you provide the compilation of the above with the same things I provided in my question, please? note that all sections below chapter have to follow the same numbering as a chapter please also note that my questions may seem rudimentary but that's because I've never used the document type book before. – Zyzzx Jun 11 at 17:07
• @Zyzzx You can test it yourself :) (I do not have time now at the moment, but I am pretty sura that this is what you want). Normally you should provide the code that is necessary to reproduce your problem, have a look at tex.meta.stackexchange.com/questions/228. – Dr. Manuel Kuehner Jun 11 at 17:09
• @Zyzzx The book class works exactly the same way as article, except you get the extra top level \chapter macro. For example you make a collection of articles into a book, just by dong something like \chapter{one} \input article1.tex \chapter{two} \input article2.tex etc. – alephzero Jun 11 at 18:09