There is a growing need for data expertise and data analysis. Companies are looking more towards analytics for improvement opportunities within the business and products. Data collection is growing at a fast pace and we need capabilities to be able to analyze it. The data volume that companies are sitting on makes this task even more important. The paper presents interviews performed with product developers who have worked on a large complex system development project. The findings explain questions and needs developers are facing and what answers they are looking for with data mining. By Identifying beneficial and meaningful outputs from data mining and data analytics, developers can be supported in making better decisions for a new designs/re-designs and ultimately make a superior robust product. The paper further accounts for 20 heterogeneous purposefully sample interviews, ranging in project roles from product development to manufacturing and testing.