1) The document analyzes genetic diversity in the 'Haarlem' collection of Mycobacterium tuberculosis strains using AFLP and MIRU-VNTR polymorphism analysis. 2) The objectives are to validate AFLP analysis for strain identification and compare it to other typing systems like MIRU-VNTR. 3) Guidelines will be formulated for interpreting chromosomal patterns for epidemiological evidence of relatedness between strains.