This document discusses common errors in research and their implications. It begins by outlining the differences between quantitative and qualitative research approaches. Common errors for various research methods like questionnaires, interviews, experiments and observational studies are then described. These errors can lead to wrong business decisions, loss of capital, and market failures if research conclusions are flawed. Finally, steps like conducting a literature review, using statistical tools, double entry of data, pilot testing, and training of researchers are suggested to minimize errors.