# Building (concatenation) debug messages, best practices (advanced flows)

**URL:** <https://community.homey.app/t/building-concatenation-debug-messages-best-practices-advanced-flows/72512>\
**Category:** Flows\
**Created:** [November 22, 2022, 6:01pm UTC](https://community.homey.app/t/building-concatenation-debug-messages-best-practices-advanced-flows/72512 "2022-11-22T18:01:29Z")\
**Posts on this page:** 1\
**Page:** 1

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**Author:** ![Tiwas](https://sea1.discourse-cdn.com/flex025/user_avatar/community.homey.app/tiwas/32/10066_2.png) [@Tiwas](https://community.homey.app/u/Tiwas)\
**Post date:** [November 22, 2022, 6:01pm UTC](https://community.homey.app/t/building-concatenation-debug-messages-best-practices-advanced-flows/72512/1 "2022-11-22T18:01:29Z")

</div>

Anyone got any good tips on how to build debug messages in a flow? I’m particularly interested in the following cases, but please add - I may not see all the possibilities.

Case 1: Concatenation  
It would be awesome to print a debug message at the end of execution instead of several places in my flow. I would like to “document” how the flow actually progressed, and at the end print the whole track in one output (if possible).

Case 2: Execution time  
Is it possible to extract the execution times for the flow? I think I’ve seen some script cutouts, but I cannot find them.