19/06/2019by admin


Colour Identification

Tests for any colour recognition deficiencies


Screeners need to be able to differentiate between orange organic material and blue metallic material whilst analysing X-ray images.

Basic Image Interpretation

Tests the ability to identify everyday objects displayed under X-ray


Under X-ray, screeners must be able to identify objects based only their shape and components.

Threat Object Recognition

Tests the candidate’s ability to identify easily recognisable objects placed in a clear, direct view or at an angle within complex bag images.


Screeners must be able to differentiate Guns and Knives from innocent objects.

Attention to Anomalies

Assesses the ability to pay attention to small anomalies in X-ray images.


Threats are generally concealed within everyday non-threat items making them extremely difficult to identify.

The only way to detect these threats is usually not through identifying exactly what they are but by spotting a small change to their expected shape or components.

For example, a laptop with an organic area and some out of place wiring may be a sign that it is concealing an IED. 

Mental Rotation

Assesses the ability to recognise a shape by its main component parts while it is being rotated at different angles.


During the screening operation, objects are not always presented in the best possible angle within a bag. Screeners must be able to mentally rotate certain items in order to correctly identify them.

Object Recognition – Superimposition

Assesses the identification of suspicious/ restricted objects obscured by other objects contained within multi-layered bag images.


 If a screener is too confident, they may make quick but reckless decisions creating a huge risk for the security operation.  

On the other hand, if a screener is not confident enough in their decision making skills, they may choose to search more bags and slow down the security checkpoint.

Sustained Attention

Assesses the sustained attention of the participant during a continuous performance task.


The likelihood that a screener comes into contact with a concealed IED or other high risk threat is very low.

This means a screener must treat each bag that goes through the X-ray machine with the same high level of attention.This is something, that after 20 minutes of screening, is very hard to maintain.

Visual Closure

Testing the ability and speed of the participant in detecting common objects.


If a screener makes quick decisions based on little information, they make mistakes and cause false alarms.

However, a screener who takes too much time to make a decision may slow down the operation to a point where passengers and visitors become frustrated.

Pre-M aims to find the candidate that possesses a balance of speed and accuracy.

Personality test

This test is designed to assess whether the participants’ personality matches the requirements of the X-ray screening job. The test assesses the following personality traits: Independence, Deliberation, Self-Consciousness, Diligence, Order, Assertiveness, Distrust, Activity Level and Tolerance for Ambiguity.