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# Post-processors

This document explains the purpose of post-processors and lists the different available post-processors and the requirements each has to be used effectively.

## What is a post-processor?

A postprocessor is a function that takes the results from the impact function and calculates derivative indicators, for example if you have an affected population total, the Gender post-processor will calculate gender specific indicators such as additional nutritional requirements for pregnant women

## Selecting a post-processor

Post-processors and their settings can be edited in the user configurable function parameters dialog. To disable a post-processor simply change the Postprocessors `"'on': True" to "'on': False"`. The same is valid for any other setting you might encounter there. If you don’t see a post-processors field, it means that the impact function you are trying to use does not support any post processor

Each activated post-processor will create an additional report in the dock and in the printout. If problems arise while post processing, the system will inform you and will skip post-processing.

## Creating post-processors

If you feel there is an important post-processor which is missing, there are two avenues you can follow:

- You can develop it yourself or with the aid of a programmer who has a good understanding of the python programming language.
- You can file a ticket on our issue tracking system, and if time and resources allow we will implement it for you.

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