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Our knowledge of stellar evolution and of the structure and chemicalevolution of the Galactic disk largely builds on the study of open starclusters. Because of their crucial role in these relevant topics, largehomogeneous catalogues of open cluster parameters are highly desirable.Although efforts have been made to develop automatic tools to analyse largenumbers of clusters, the results obtained so far vary from study to study, andsometimes are very contradictory when compared to dedicated studies ofindividual clusters. In this work we highlight the common causes of thesediscrepancies for some open clusters, and show that at present dedicatedstudies yield a much better assessment of the nature of star clusters, even inthe absence of ideal data-sets. We make use of deep, wide-field, multi-colourphotometry to discuss the nature of six strategically selected open starclusters: Trumpler~22, Lynga~6, Hogg~19, Hogg~21, Pismis~10 and Pismis~14. Wehave precisely derived their basic parameters by means of a combination of starcounts and photometric diagrams. Trumpler~22 and Lynga~6 are included in ourstudy because they are widely known, and thus provided a check of our data andmethodology. The remaining four clusters are very poorly known, and theiravailable parameters have been obtained using automatic tools only. Our resultsare in some cases in severe disagreement with those from automatic surveys.

On the assessment of the nature of open star clusters and the determination of their basic parameters with limited data