> For the complete documentation index, see [llms.txt](https://help.claritylims.illumina.com/llms.txt). Markdown versions of documentation pages are available by appending `.md` to page URLs; this page is available as [Markdown](https://help.claritylims.illumina.com/integration-toolkits/lltk/lltk-working-with-the-script/lltk-data-collection-entities.md).

# Data Collection Entities

When working with the Lab Logic Toolkit *evaluateDynamicExpression* script, custom field values can originate from the following data collection entities (these will differ, depending on the step from which the script is being run):

* input (analyte/derived sample)
* output (analyte/derived sample or per-input result file, measurement, or file placeholder)¹
* step
* container
* submittedSample / submittedSamples²

¹ Shared and per-reagent-label result files / measurements (e.g., those produced by a demultiplexing step) are not supported.

² Use 'submittedSamples' with pooled derived samples, and 'submittedSample' for single-source derived samples.


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