1. A computer based method for determining whether biometric samples are from a same source, comprising the steps of: comparing a first biometric sample with a second biometric sample with a general purpose computer, wherein said first and second biometric samples form at least one cluster of at least one vector based on feature similarities between said first and second biometric samples; and, determining by means of said general purpose computer whether said first and second biometric samples are from said same source, wherein the first biometric sample and the second biometric sample are handwriting samples and said at least one cluster is a composite based on a model for measuring the distance between a first binary feature vector and a second binary feature vector and wherein the accuracy of said model is measured by calculations involving features selected from the group consisting of micro-features, macro-features and a combination of micro- and macro-features.