In the case list screen it is often useful to display the history of a tracked value like patient weight or blood pressure. This can be done by following the Incrementing a counter trick, but using a string concatenation instead of an increment:
previous_weight_historyis set by the case
weight_historyCalculate Condition becomes something in the lines of
concat(/anc/. The final dash is a separator that ensures the evolution of the value can be easily read.
The output of this would be "55 - 56 - 54 - " and would continue to add