The third phase, drawing on the ‘theory of planned
behaviour’, helps to explain why some people act
on their suicidal thoughts (by attempting suicide)
and others do not. According to the model, the
presence of ‘volitional factors’ increases the
likelihood that a suicide attempt will occur. For
example, a key factor is a suicide plan: suicide
becomes more likely (perhaps in response to a
critical situation) when a detailed plan is developed,
including when an individual will attempt suicide,
where that will be and the method they would use.
A second factor is acquired capability for suicidal
behaviour, the ability to enact one’s plan or
intentions. Other factors include pain sensitivity,
impulsivity, imitation (of suicidal behaviour in
others) and access to the means to end one’s life.