Although Sierra Leone is ranked the 4th position by the DBP, GWSM ranks Sierra Leone the 19th position because of the highest degree of uncertainty with a value of 0.
Also, uncertainty and the weights of the criteria are the two factors for the difference in rankings using the DBP and GWSM methods.
Sensitivity analysis is performed to show the robustness and the degree of uncertainty covered by the GWSM results.
The main contribution of this paper is that GWSM can evaluate alternatives over a period of years, and it can open new possibilities for multiple hybrid evaluation methods.
The GWSM provides a better evaluation result over a period of 8 years.
The GWSM is a framework for decision-making under uncertain decision environment.