This webinar presents the tools and methods employed in the CUTLER platform for the collection, harmonisation and anonymisation of heterogeneous data, enabling policy making in the five CUTLER city pilots. The webinar will be open to a diverse technical audience of students, researchers, software developers, and smart city architects from around the world. By taking this webinar, participants will have increased: skills to collect and harmonise diverse data types and sources for policy making; knowledge of the tools needed for populating a data lake; ability to overcome challenges in data collection in a policy making context. Examples of crawlers developed for the CUTLER pilots will be demonstrated and explained.  Helpful material (CUTLER reports & software): · CUTLER GitHub repository – Data crawling software · User manual for CUTLER data crawling software · D3.2 - First version of the framework for the collection, cleaning, integration & anonymization of big data · D3.3 - Updated version of the data collection, management & protection framework integrated within CUTLER architecture   · D3.5 - Final version of the data collection, management & protection framework integrated within CUTLER architecture