Between the 15th and 22nd April, I was at the 6th International Workshop on Data Analysis in Astronomy «Livio Scarsi». The workshop was organized in Erice at the Ettore Majorana Foundation and Centre for Scientific Culture. The conference theme was quite large, Modelling and Simulation in Science, with contribution from three major branches: Astrophysics, Biology and Climatology. With my PhD Student, J.C. Torrel, we presented our works on hierarchical muti-agent approach through two examples: LifeDrop for the study of evolution dynamics and our results in comological simulations. A great time with many interactions, in a delightful medieval ambience and splendid location of Erice located on high ground overlooking the northern coast of western Sicily.