The “Peaple” uses different models for simulation of different quality indices. For description of firmness changes a logistic equation is always used. The changes of acidity are described always by exponential equation. The change of soluble solids content is also described by exponential equation. The colour of peaches and apples is simulated by different models, depending on the colour coordinate/attribute. For simulation of L* and b* coordinates an exponential model is used, while for simulation of a* coordinate and hue attribute a logistic equation is used.