This, along with other interview questions on TOGAF, is a regular feature in TOGAF interviews, be ready to tackle it with an approach mentioned below. The interviewer is more likely to ask such questions to you if you have shown previous work experience in your resume. This is a common instance that you would have been at or at least encountered. So, there is nothing to be regretful about it. The interviewer wants to check your acceptance skills. Your critical thinking and other related abilities may also be tested with this specific instance. So be candid and genuine with your response. If you have been in such a situation, go ahead and concisely narrate two things. One, how you convinced your colleague to do your work. Two, how you verified their results and did not blindly use them. For instance, you can say, "Yes. There was a time when I had to multi-task and found my work unproductive. So, I convinced my colleague who wanted a day off (who also promised to compensate me) to do my XXX analysis on his compensation work day as there were no significant tasks to be assigned post that weekend. Once he was done with it, I thanked him and took some time from my recess to proofread and cross-check the analysis result before I moved with the next step of designing the architectural solution".