Decision making with two factors

Hi,

Let me state that I am not a math guru, although I love logic, thats why I come here. Perhaps someone can (wants) lend me a hand in approaching this problem.

I try to explain the situation as thoroughly as possible, if you miss any information please let me know.

I am busy with a quality analysis of a software product. I've worked on it quite a bit and it is now boiling down to the question "what is the most interesting part of the software to work on to get the most quality increase with the least amount of effort required".

The total quality of a product is basically the sum of all its properties and how each properties scores. All properties have a relation, meaning one property is more important than another property. Properties in this case are very humanly approaches of quality. Bear with me ok?

What it boils down to is that for each property I now have two variables:

- percentage of how much a property *could* improve

- percentage of how much influence the property has on the currently total score.

To get more concrete, lets say there is property Z:

- it could improve for about 41,90% (you could say, it has now scored 58,10% of its potential)

- it has currently an influence of 8,33% of the total score

I have five other properties with each the same (types of) percentages. (of course, they have different values)

Now i have to make a decision, what property should be worked on? Is it possible to use these two percentages together?

Like I said I am not a math guru, so I simply tried multiplying both percentages.

In this case Z would be : 3,49% (0,4190 * 0,0833). But I don't know its meaning.

Could anyone give me any advice?