# Setting up a Decision Tree

The following topics guide you through configuring a Decision Tree before building it:

1. [Base selection](<https://help.apteco.com/en/faststats/modelling/decision-tree/setting-up/base-selection/index.md>)
2. [Random base selection](<https://help.apteco.com/en/faststats/modelling/decision-tree/setting-up/random-base-selection-validation/index.md>)
3. [Choose your dimensions](<https://help.apteco.com/en/faststats/modelling/decision-tree/setting-up/choose-dimensions/index.md>)
4. [How are flag arrays used?](<https://help.apteco.com/en/faststats/modelling/decision-tree/setting-up/flag-arrays/index.md>)
5. [How are numeric variables and expressions used?](<https://help.apteco.com/en/faststats/modelling/decision-tree/setting-up/numeric-variables-expressions/index.md>)
6. [Configure the dimensions](<https://help.apteco.com/en/faststats/modelling/decision-tree/setting-up/configure-dimensions/index.md>)
7. [Dimension setting suggestions](<https://help.apteco.com/en/faststats/modelling/decision-tree/setting-up/dimension-settings/index.md>)
8. [Set the stopping conditions](<https://help.apteco.com/en/faststats/modelling/decision-tree/setting-up/stopping-conditions/index.md>)
9. [Set the algorithm options](<https://help.apteco.com/en/faststats/modelling/decision-tree/setting-up/algorithm-options/index.md>)
10. [Set the CHAID options](<https://help.apteco.com/en/faststats/modelling/decision-tree/setting-up/chaid-options/index.md>)
11. [Set the PWE options](<https://help.apteco.com/en/faststats/modelling/decision-tree/setting-up/pwe-options/index.md>)
12. [Set the split validation options](<https://help.apteco.com/en/faststats/modelling/decision-tree/setting-up/split-validation-options/index.md>)
13. [Set the marketing costs](<https://help.apteco.com/en/faststats/modelling/decision-tree/setting-up/marketing-costs/index.md>)
14. [Change the default options](<https://help.apteco.com/en/faststats/modelling/decision-tree/setting-up/default-options/index.md>)
15. [Influence the automatic build process](<https://help.apteco.com/en/faststats/modelling/decision-tree/setting-up/influence-automatic-build/index.md>)
16. [Manually control the build process](<https://help.apteco.com/en/faststats/modelling/decision-tree/setting-up/manual-build-control/index.md>)
17. [Suggestions for influencing the build process](<https://help.apteco.com/en/faststats/modelling/decision-tree/setting-up/build-process-suggestions/index.md>)
18. [When are the next splits updated?](<https://help.apteco.com/en/faststats/modelling/decision-tree/setting-up/next-splits-timing/index.md>)