Thanks for the help and patience! It is a function on the class so I suppose for read that function list I need self.steps Where I'm wrong? @property def steps(self): return [ self.trimmomatic, self.merge_trimmomatic_stats, self.star, self.picard_sort_sam, self.rnaseqc, self.wiggle, self.cufflinks, self.gq_seq_utils_exploratory_analysis_rnaseq ]