# String Model Score for Blue Read

For Blue Read tool, a model score (model match score) is a combination of two things:

- The average score of the features in this model

- The "geometry score" based on the geometrical arrangement of the features in this model

As the geometrical arrangement is included in the calculation of the overall model match score, the model score could be less than 100% even when all the features have a perfect score of 100%, given that the geometry score is less than 100%.

For the string model, the "geometry score" is based on a combination of:

- how close the feature positions are to lying on a single line

- how equally the characters are spaced

For example, with a string model, given 3 features of score 100%, the overall match score will be slightly less than 100% as the geometry score of this model is less than 100%. The geometry score will always be less than 100% unless all the features are exactly collinear and exactly equally spaced.