##  Calculating a Weighted Technical Fit Score
This calculation determines a weighted technical fit score (custom field) for IT component fact sheets based on their stability, maintainability, and security ratings. It defines a scoring object that maps qualitative ratings (best, aboveAverage, average, belowAverage, and worst) to numeric scores and a weighting object that assigns weights to each of these criteria.
The function first checks if a fact sheet contains valid ratings for custom fields stability, maintainability, and security. If all ratings are present, it calculates a weighted average score by summing the products of each rating's score and its corresponding weight, then dividing by the total of the weights. If any of the ratings are missing, the function returns null, and the target field is set to empty.
**Sample Code**
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```
export function main() {
    if (data.stability == null || data.maintainability == null || data.security == null) {
        return null;
    }

    const scoring = {
        best: 100,
        aboveAverage: 75,
        average: 50,
        belowAverage: 25,
        worst: 0,
    };
    const weighting = {
        stability: 1,
        maintainability: 1,
        security: 2
    };
    const totalWeights = weighting["stability"] + weighting["maintainability"] + weighting["security"];
    const technicalFitScore = (weighting["stability"] * scoring[data.stability] + weighting["maintainability"] * scoring[data.maintainability] + weighting["security"] * scoring[data.security])/totalWeights;
    return technicalFitScore;
}
```

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