The subject of my Ph.D. thesis was to study the evolution of the circumstellar disks around intermediate mass stars, the so-called Herbig Ae/Be stars, using data from the simultaneous multi-wavelength and multi-telescope EXPORT International Program at La Palma observatory, led by Prof. Carlos Eiroa, from the Universidad Autónoma de Madrid. The goal of this research was to analyze close-to-simultaneous optical to near-IR photometry and optical spectroscopy of moderately large sample of intermediate-mass Herbig Ae/Be stars to get information about the dissipation mechanisms of their disks, which could potentially give information about their potential to form exo-planets.