| Index | Category | Value | Description | 
 
   
   | Probability of attack | Certain threat (I) | >76 | Objective or similar object suffered from the terrorist attack and the threat was identified by special services. | 
 
   
   | Possible (II) | 50-75 | Objective or similar object suffered from the terrorist attack and the threat was not identified by special services. | 
 
   
   | Potential (III) | 25-49 | The area near the objective suffered from the attack, but not the objective. | 
 
   
   | Minimal (IV) | <25 | Objective and surrounding area were not affected by the attack. | 
 
   
   | Objectivevulnerability | Very high (I) | >76 | A nationally significant objective that has a very high appeal to terrorists, and protection measures or level of protection are extremely insufficient. | 
 
   
   | High (II) | 50-75 | A regionally significant objective, a great attraction for terrorists and protection measures or level of protection are insufficient. | 
 
   
   | Medium (III) | 25-49 | Regional objective with potential appeal to terrorists and inadequate protection | 
 
   
   | Maximum (IV) | <25 | Sufficiently low-profile objective, which has a possible attractiveness for terrorists and a sufficient level of protection (adequate) | 
 
   
   | Consequences | Catastrophic (I) | >76 | Most people or assets are destroyed without the possibility of recovery; functioning is completely impossible and cannot be restored in a short time; serious indirect effects. | 
 
   
   | High (II) | 50-75 | Many people or property are damaged; the operation of part of the object is stopped and can be restored after some time; some degree of indirect effect. | 
 
   
   | Medium (III) | 25-49 | Some people or property is lost; general operation continues, some functions are temporarily stopped and can be restored after a short period of time; low indirect effects. | 
 
   
   | Low (IV) | <25 | Almost no loss of people and property; functioning continues. There are no indirect influences. |