As part of the standard material transfer agreement (sMTA), users of CGN material are requested to donate their evaluation data to CGN after finalization of the experiments. These data are processed by CGN, included in their information system and made publically available on-line or in downloadable files. In addition, evaluation programs are carried out in close collaboration with seven lettuce breeding companies affiliated to the Dutch association for the plant reproduction material sector (Plantum NL).

Data from such joint experiments can be exploited exclusively by the involved parties for an agreed time period (usually 5 years) before they are made publically available by CGN (Van Treuren et al., 2011). The majority of available evaluation data are related to resistances to pest and diseases, such as downy mildew (Bremia lactucae), powdery mildew (Erysiphe cichoracearum), leaf aphids (Macrosiphum euphorbiae, Nasonovia ribisnigri and Uroleucon sonchi), root aphids (Pemphigus bursarius), lettuce drop (Sclerotinia sclerotiorum) and tomato spotted wilt virus (TSWV). Data are also available on chemical compounds, such as nitrate, iron and ß-carotene.