A teacher should analyse the various errors made by students on a given task because

Error analysis is a valuable diagnostic tool that reveals students' thinking processes, misconceptions, and gaps in understanding. By analyzing errors, teachers gain insights into how students are constructing knowledge and can design targeted interventions. Errors are not failures but windows into learning. Using errors for punishment or segregation harms students, and learning involves more than just error correction—it includes building understanding, making connections, and developing skills.