In this paper, we argue that there is a need for the streams to be ripe at the moment of legislation approval to increase the probability of policy implementation. We developed a model of analysis that applies MSA, departing from a qualitative approach we purpose an empirical mathematical model which allows policy makers to evaluate the probability of successful implementation, given the variables available at decision moment. The contribution of this paper is to inform policy makers on the need to work towards policy acceptance, reducing the rate of non-enactment and legislative inefficiency.We applied the model to the case of public private partnerships in education (ePPPs), using the Inner City Technology Colleges, which was the first attempt to create ePPPs by Margaret Thatcher in 1986. We conclude that the reason for implementation failure lies on the lack of balance between the streams, who were not ripe at the time of legislation.