Throughout this talk, we'll discover several ideas that I will use as input variables for the prediction at the end of the talk. The idea of "What's goes up..." is actually the first variable that we'll use.
TODO: maak een plaatje voor 'Prediction variable', dat bij elk nieuw geïntroduceerd idee als een fragment op de slide gegooid wordt.

In Stack Overflow’s 2015 developer survey, 69.3% of respondents used Git, almost twice as many as used the second-most-popular version control system, Subversion.1 After 2015, Stack Overflow stopped asking developers about the version control systems they use, perhaps because Git had become so popular that the question was uninteresting.

In Stack Overflow’s 2015 developer survey, 69.3% of respondents used Git, almost twice as many as used the second-most-popular version control system, Subversion.1 After 2015, Stack Overflow stopped asking developers about the version control systems they use, perhaps because Git had become so popular that the question had become uninteresting.

# Measuring Version Control System Popularity
<!-- TODO: haal recente data over Git, Mercurial, Subversion, Darcs, Fossil, Plastic en Pijul uit Google Trends.  -->

note:
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## Features That Pijul Promises
* **distributed** version control
* **simple**, because of its basis on a *sound theory of patches*
* **fast**, because it aims to fix the Darcs performance issues
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## Quick Facts
* written in Rust
* *bootstrapped* since April 2017
* comes with a hosting platform called 'The Nest'
note:
Rust is one of the faster languages around, because it is a low-level language.
Its performance is comparable to that of C++.
Bootstrapped means that it is used for its own development.
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## Patch-oriented design
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## Quick demo
* Recording patches
* Ignore
* Removing patches
* Patch dependencies
* Branches
* (but maybe we don't need them)
note:
TODO: demo voorbereiden
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## Pijul for Git users

[https://nest.pijul.com/tae/pijul-for-git-users](https://nest.pijul.com/tae/pijul-for-git-users)

## Fossil for Git users

[https://www.fossil-scm.org/home/doc/trunk/www/fossil-v-git.wiki](https://www.fossil-scm.org/home/doc/trunk/www/fossil-v-git.wiki)

## Prediction variables
* What goes up, must come down.
* Killer features
* Hosting platform support
* Bundled with operating system
* The disadvantage of the most popular product
note:
* **What goes up, must come down.** But when?
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