Cog allows you to quickly compare and analyze word lists from different language varieties using an iterative approach. Initially, you might be confronted with a large amount of data and have a limited understanding of the phonological and morphological structures of the language varieties. Using an iterative approach, you can quickly make sense of the data and then progressively refine the word lists and settings, improving the comparison results and your understanding of the varieties at each step. Cog provides you with analytical tools to assist you with many tedious and mundane tasks, freeing you up to focus on higher level sociolinguistic questions.