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You can first learn how it works with the filled in example. It is constructed so that you can input your own factors that effect your decision making process. You can change the alternatives, the titles and the weights. With your own opinion numbers in the matrix you will get a result that tells you what decision to make. It is a decision matrix that you can use over and over again. There is even a button to let you print out the results.
Along the left hand side are listed all of the your possible decision alternatives. Next enter the determining factors that you are interested in along the top. You then need to decide the weight for each factor. The example shows safety risk as a 4 and management difficulty as a 2. This means that you feel that safety is twice as important a factor as management difficulty. The final entries are for your opinion(scale of 1-10) of what your opinion is of how a given factor affects a given alternative. Remember that negative factors are opposite. This means that for a negative factor such as safety risk, high numbers mean low risk. For a positive factor such as stability, high numbers mean high stability. The winner is the highest number in the totals column. You still may have to decide between 2 or more alternatives whose totals are the same or very close. However, you will have eliminated a whole lot of less desirable alternatives.
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This example of a decision matrix gives you a logical approach to analyzing your decision alternatives. It is designed to give you full flexibility in developing a logical approach and printing your result.
Note: This rational decision making model is sometimes called the Pugh matrix.
If you have any questions about how decision matrices work, please ask them here.