Guy’s ten stage framework (1990)
1 Define the problem.
2 Identify the goal to be achieved.
3 Specify all dimensions of the problem.
4 List all possible solutions to each dimension.
5 Evaluate alternative solutions to each dimension regarding the likelihood of each to maximise the important values at stake.
6 Eliminate alternatives which are too costly, not feasible or maximise the wrong values when combined with solutions to other dimensions.
7 Rank the alternatives to each dimension according to which are most likely to maximise the most important values.
8 Select the alternative to each dimension that is most likely to work in the context of the problem while maximising the important values at stake.
9 Combine the top ranking alternatives for each dimension of the problem in order to develop a solution to the problem as a whole.
10 Make a commitment to the choice and implement it.