Dear Rob / All I have studied http://www.kohadocs.org/codingguidelines.html and http://wiki.koha.org/doku.php?id=en:development:codingguidelines for coding guidelines in Koha but looking for more. Actually I want to make some additional reports in koha. For example I want to have a report of Biblio records between two limits of barcode numbers. Now the query for this report is as under: SELECT items.barcode, biblio.title, biblio.author, biblio.copyrightdate, items.price FROM items, biblio WHERE items.biblionumber=biblio.biblionumber AND CAST(items.barcode AS UNSIGNED) BETWEEN 1 AND 10000 ORDER BY CAST(items.barcode AS UNSIGNED); Can someone guide me how to create .pl and .tmpl file for this query. User will input starting barcode and ending barcode in form and will get the results in PDF/HTML format Ata LISolutions http://www.lisolutions.org/