Is it possible to stay innovative and economically manage many hundreds or even thousands of products or product variants? Organisations interested in benefiting from a product line and product platform approach must adopt values and organisational principles that encourage the development of deep domain expertise. This includes a deep understanding of the forces that continuously change the environment of the product line. These forces can then be harnessed as part of the architectural foundation for the product line. The pervasive digitisation of services and the desire to create and operate platforms that can support large digital service ecosystems that include many organisations, have put the spotlight on design principles for product lines, product platforms, and related organisational structures. These slides relate to a talk at ProductTank Auckland (https://www.meetup.com/ProductTank-Auckland/events/252496542/). The video recording is available at https://twitter.com/pmauckland/status/1021272934416109568.