en General Architecture General Architecture Research Paper Research Paper Cracks emerge due to various forces or stresses. After discerning the cracks preferably by non-destructive techniques, there is a need to find the reason for their appearance. With very exact analysis of the shape, form and dimension of the cracks and their location on the structural elements, we can deduce the reason for their formation. This makes, proposing a suitable solution for preventing the expansion of cracks possible. cracks, un-reinforced masonry, historic buildings, diagnosis, typology 41 52 http://ijaup.iust.ac.ir/browse.php?a_code=A-10-1-5&slc_lang=en&sid=1 Fatemeh Mehdizadeh Saraj mehdizadeh@iust.ac.ir 18003194753284600145 18003194753284600145 Yes