Think about the last time a contractor or employee did not carry through on their promises or meet your expectations for quality of work. These situations make great examples for this question! Provide the interviewer with what work the contractor or employee was supposed to be doing for you, and share what the outcome of the contractor's or employee's work actually was (...or, perhaps lack thereof if they failed to complete the project altogether). Next, share how you reached out to the contractor or employee either via phone to talk about the issue or on-site to talk face-to-face. Discuss how you professionally and graciously told the contractor or employee the issue and expressed your disappointment. Share what remediation you requested. You may have asked for the project to be re-vamped. You might have asked for your money back to move on. Or, you may have asked for the project to be started all over again. Finally, be sure to mention that you enjoy working with contractors and employees & typically don't have any issues with them. The challenging ones are few and far between, and you try to work with all of them on a pleasant and professional basis to maintain a positive image for the company.