It is funny how different ones views on 'what is logical' can be. To me it is obvious to put all the instructions for an assignment (result, criteria, form of feedback) in the introduction of the Assignment. If it doesn't all fit in the Introduction window I first reflect on the complexity of the task: is all this REALLY necessary? If so I offer a pdf with instructions that ptcpnts can download, even print, if they want to refer to it while working on the task.
For quite a lot of Moodle teachers the opposite is logical. They upload a File called f.i. Task ABC about XYZ. Then, the ptcpnt has to scroll down to the Assignment with a variation on the task title where he has to turn his work in. Here no information is given about the task. It is nothing more then an Inbox for the teacher. There can even be a totally separate topic in the course called 'Assignments' with just a list of Inboxes.
This issue has been nagging at me for as long I am using Moodle (about 6 years!). What would be the best practise?