Abstract: Techniques for identifying sources of error occurring during processing of biological samples in a laboratory environment. The techniques may include obtaining data about the biological samples, where the data is generated by processing the biological samples in accordance with a sample processing workflow. The sample processing workflow is performed using physical component(s) and/or workflow process(es). The techniques further include determining values of quality metric(s) associated with the sample processing workflow for the biological samples, identifying source(s) of error for the data by using the values of the quality metric(s) and statistical model representing causal relationships among the physical component(s) and the workflow process(es), and outputting information indicative of the identified source(s) of error.