Humans make errors in their thoughts, in their actions, and in the products that might result from their actions.Humans can make errors in any field. Ex: observation, in speech, in medical prescription, in surgery, in driving, in sports, in love and similarly even in software development.Example:An instructor administers a test to determine how well the students have understood what the instructor wanted to conveyA tennis coach administers a test to determine how well the understudy makes a serve.