An interesting presentation was given to attendees of the ITU-T SG16 meeting attendees this past week by Mr. Olivier Dubuisson on the topic of ASN.1. You can preview the slides at:
http://asn1.elibel.tm.fr/biblio/improve-your-ASN1-specifications.htm
or download the zipped PowerPoint file from:
http://asn1.elibel.tm.fr/biblio/improve-your-ASN1-specifications.zip