Hi Michael, I have read the threads regarding this topic but I am still a bit confused and want to clarify what breaches_per_month uses as input. Firstly, preprocess takes the input file Cyber_Security_Breaches_noym.tsv as input. This then outputs a cleaned data file to stdout (perhaps using cat clean_data_file.tsv). Please correct me if this is wrong. Then, breaches_per_month takes a .tsv file as input, (which for testing purposes you will run "preprocess Cyber_Security_Breaches_noym.tsv" and redirect the output to breaches_per_month). However, we should design breaches_per_month to take an input file (say clean_data_file.tsv) as its argument? If this is not the case, then how will you redirect the stdout so breaches_per_month can accomodate for this. Cheers