Cities are complex systems. One of the main properties of a complex system is dynamic, consequently, the urban patterns constantly change. The lifestyle pattern, living pattern and working pattern of the population impact the inflow and outflow of individuals, their interactions, the interrelationship of economy and geography, and rapid advance in technology. The dynamic between these factors further causes the emergence of new patterns of change. 

The Dynamic City Project focuses on employment characteristics relating to the economical factor. Employment Statistics (LODES) provides information about the geographic employment patterns by employment location and residential location. Variables tracked include earning, industry, sex, race, and educational attainment between 2009 and 2017 in the state of California. The project displays which subcategory of variables dominate at city and zip code level for both employment location and residential location.