Previous Test Results

Test results are provided in the form of a Post-Test Information Package, or PTIP. Each PTIP describes the test design, group outcomes as well as individual (anonymized) results. Instructions are included in each PTIP for interpretation of the test. A breakdown of a generic PTIP is provided on our page entitled ‘What is a PTIP?’

STA Program for FDEs

Brief Background

Forensic handwriting examination can simply be regarded as a skill. The skill is applied to cases which vary according to the amount and complexity of both the questioned and known material. No one test will determine the validity of the skill. Over time, given sufficient trials, a picture of the skill for individuals should emerge. This will allow us to determine whether or not skills claimed by examiners are valid and reliable and will also allow us to estimate the potential error (misleading) rate for different types of examinations/comparisons.

Previous Tests – PTIP

S-01 (2008): Barrage-style signature trial (60 Q signatures, all types of questioned signature)

S-02 (2009): Barrage-style signature trial (60 Q signatures, all types of questioned signature)

S-03 (2011): Barrage-style signature trial (60 Q signatures, all types of questioned signature)