Reference no: EM133910454

Rephrase:

The Theory of Planned Behaviour (TPB) posits that intentions are the primary predictors of behaviour, influenced by attitudes, subjective norms, and perceived behavioural control (Ajzen, 1991). However, despite strong intentions, people often fail to act, particularly in health behaviours. One major limitation of TPB is its assumption that intention will lead to action if perceived control is high. In reality, behavioural execution is often disrupted by situational barriers such as stress, time constraints, or lack of immediate motivation (Sniehotta et al., 2014). For example, someone may intend to exercise regularly but fail due to fatigue or competing responsibilities.

Additionally, TPB overlooks the role of habits and automatic processes. Health behaviours like snacking or smoking can be governed more by routine and environmental cues than conscious intention (Gardner, 2015). This weakens the predictive power of intention, especially for ingrained or impulsive behaviours.

Furthermore, TPB does not adequately account for the intention-behaviour gap. Meta-analyses have shown that intentions explain only a moderate amount of variance in behaviour (Webb & Sheeran, 2006). To bridge this gap, researchers suggest incorporating volitional factors such as action planning and self-regulation strategies, which are not included in TPB.

In summary, while TPB offers a useful framework for understanding health behaviour motivation, its limitations lie in underestimating contextual factors, automaticity, and volitional processes, all of which critically influence whether good intentions translate into action.