2.2 Theoretical Framework The theory adopted for this study is the Theory of Planned Behaviour (TPB), an extension of the theory of reasoned action postulated by Icek Ajzen, a psychologist in 1991. Studies in waste management apply this theory because, as a concept under pro-environmental behaviours, it helps in predicting the likelihood that an individual or a group of people will engage in certain environmental behaviours considered to be impactful on the environment (Vassanadumrondee & Kittipongvises, 2017; Ifegbesan 2010; Mancha & Yoder, 2015). According to Ajzen (1991), an individual’s intention to perform various kinds of behaviours can be predicted to a high degree of accuracy using three variables viz the individual’s attitude towards such behaviours, through subjective norms, and perceived behavioural control. He further expatiated that, the intentions of such an individual coupled with perceptions of behavioural control are useful tools for explaining behavioural variance. The main thrust of this theory is the intention of an individual, which is a crucial factor that motivates that person to act in the way he or she does but, in any case, some behavioural trends can be propelled by such eternal factors like time, money, the cooperation or approval of others. In his concept, attitude is simply the level to which a person evaluates a behaviour before he or she decides to perform it. Subjective norm on the other hand explains the influence of social pressure which causes one to behave in a certain way while perceived behavioural control is the perception of people on how difficult or easy it is to perform a behaviour (Ajzen, 1991).
