A reconstruction is necessary whenever it is impossible to determine the method used to cause the damage sustained. Examples could be the need to establish the sequence of events or the use of a particular tool for forcing doors and windows.
Reconstructions are particularly valuable when establishing malicious intent (an act with the purpose of causing damage), or to establish a course of action where damage was caused unintentionally (negligence which led to unforeseen damage). It is also essential to determine whether the evidence would support a case of acting with intent, or would point to fraudulent simulation.
Reconstruction requires a careful inspection and survey of the premises, including taking measurements and photographs. Using a computer simulation program, the process of tampering is demonstrated by working backwards from the scene of the incident, using available evidence, until pre-damage conditions are arrived at. This process would establish, for example, the use and type of tools, the subsequent development of marks and traces, and the range of actions taken by the perpetrator. When necessary, it is also possible to identify the amount of force used, which may provide an additional basis for an investigation.
The computer simulation program was created drawing on extensive experience, and by adapting a series of tests to suit different scenarios.