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\end{enumerate}  These assumptions will obviously limit the practical usages of the model, as the model's outcomes would not represent results in a real world environment. However, the model may be adapted in order to incorporate dimensions from a real world scenario, such as that of Yellow Fever in Angola. In order to adapt the model to fit the situation, understand of the underlying, or basic model is required. This will be explained below. As stated above, individuals may be in one of three categories. The equations below show the number of people in each of the three categories as a function of time.  \begin{align*}  S &= S(t) && \text{fraction \text{absolute number  of population that is people who are  susceptible} \\ I &= I(t) && \text{fraction \text{absolute number  of population that is people who are  infected} \\ R &= R(t) && \text{fraction \text{absolute number  of population that is people who are  removed} \end{align*}