“…From the perspective of TOC, besides protective capacity, real environments should also have buffers to protect system constraints, reflecting not only the perception that the constraint must be protected from system variability, but also that, due to this variability, any attempt to find optimal values during the planning phase, including the production mix, is inappropriate. In TOC applications, the search for optimal or accurate values of these planning elements is seen as a fruitless attempt to optimise within the noise Goldratt 2006, Schragenheim, Dettmer, andPatterson 2009). Mabin (2001) affirms that, as a 'heuristic', the Ti=UC rule can lead to good solutions, but can also lead to erroneous solutions in some situations.…”