Literate Programming (LP) was invented by Dr. Donald Knuth in the 1980s. It views programming as a mainly literary activity, where the main task is to concentrate on explaining to humans what the computer must do, and the program is a secondary message embedded in a resulting documentation Web. LP raises documentation from being an often neglected afterthought, to becoming the main principle of program organization. This involves using two different languages together: program source code, and a natural human language for documentation.