1. A computer implementable method for identifying previously processed case-based documents similar to a new case-based document, the method comprising: receiving at least one static attribute and at least one dynamic attribute of a new case-based document, wherein the at least one static attribute is common to a plurality of previously processed case-based documents and wherein the at least one dynamic attribute is specific to the new case-based document; comparing the at least one static attribute of the new case-based document with corresponding static attribute of the plurality of previously processed case-based documents; obtaining a sub-set of case-based documents from the plurality of previously processed case-based documents based on the comparing of the at least one static attribute; comparing the at least one dynamic attribute of the new case-based document with corresponding dynamic attribute of the sub-set of case-based documents; and identifying presence of at least one previously processed case-based documents from the sub-set of case-based documents based on the comparison of the at least one dynamic attribute.