The Additional Features Score is a subjective evaluation of the extra features a paper shredder has, which improve its usability, convenience, and overall performance. This score is used to compare different shredders when assessing their value. Here's a guideline on how to calculate the Additional Features Score on a scale of 1 to 10:

1. Make a list of the additional features that you find valuable in a paper shredder. These can include AutoFeed, quiet operation, energy-saving modes, safety features, bin capacity, etc.
2. For each feature, assign a weight based on its importance to you. For example, if quiet operation is very important, you might assign it a weight of 3, whereas if energy-saving mode is less important, you might assign it a weight of 1.
3. Evaluate each shredder's additional features by assigning a score (1-10) for each feature, with 1 being the least desirable and 10 being the most desirable.
4. Multiply the score of each feature by its corresponding weight and sum up the weighted scores.
5. Normalize the sum by dividing it by the total of all feature weights. This will give you a score between 1 and 10.

For example, let's say you have three features and their weights:

1. Quiet operation (weight: 3)
2. Energy-saving mode (weight: 1)
3. AutoFeed (weight: 2)

If a shredder has excellent quiet operation, an average energy-saving mode, and no AutoFeed, you might assign the following scores:

1. Quiet operation: 9
2. Energy-saving mode: 5
3. AutoFeed: 1

Now, calculate the weighted sum:

(9 * 3) + (5 * 1) + (1 * 2) = 27 + 5 + 2 = 34

Finally, normalize the score:

34 / (3 + 1 + 2) = 34 / 6 ≈ 5.67

In this case, the Additional Features Score for the shredder would be 5.67.

Keep in mind that the Additional Features Score is subjective and based on your preferences. Different users may assign different weights and scores to the features based on their individual requirements.