# Explanation

Understanding-oriented discussion. These pages explain the reasoning
behind the choices Mergen asks you to make: why space-filling in the
first place, which criterion, which optimiser, how many runs, and
how to read the quality evidence.

```{toctree}
:maxdepth: 1

why_space_filling
choosing_criterion
choosing_algorithm
quality_metrics
sample_size
design_philosophy
```