This book constitutes revised selected papers from the 3rd International Conference on Lean and Agile Software Development, LASD 2019, and the 7th Conference on Multimedia, Interaction, Design and Innovation, MIDI 2019, which took place under the umbrella of the 14th Federated Conferences on Computer Science and Information Systems, FedCSIS, in Leipzig, Germany, in September 2019.   LASD 2019 received a total of 30 submissions, of which 6 full and 1 short paper are included in this volume. For MIDI 2019 one short paper was accepted for publication in this book, from a total of 6 submissions.