Tribute to Siegfried (Zig) Engelmann, co-developer of Direct Instruction https://iferi.org/iferi_forum/viewtopic.php?f=3&p=2469 -------------- next part -------------- An HTML attachment was scrubbed... URL: <http://lists-prod.uoregon.edu/pipermail/di/attachments/20190313/64573862/attachment.html>