"At my last job, I was teamed up with a colleague for a project that had a tight deadline. When my coworker and I initially met to discuss the objectives of the project, we decided to divvy up the workload so that we could get everything done in time to meet our deadline. When we came together after working apart on our separate project portions, I was surprised to discover that my colleague had not validated his data before moving on to other stages in the process. In my opinion, this made his final conclusions unreliable because I wasn't sure that they were based on accurate data. I ended up escalating the issue by meeting privately with my manager and expressing my concerns. We then met together with my colleague who agreed that our concerns were valid. In order to meet our deadline and present correct conclusions, I stayed late with my colleague and helped him re-do his portion of the work. In the end, I learned that when I'm working with someone new I need to communicate my expectations upfront about how important validating and cleansing the data is and then occasionally check in on them throughout the project to ensure that it's been done."