Good instructions probably need to be relatively short, precise and comprehensive – not an easy task. The points made by Räsänen include for example the expected genre of writing. It might be interesting to get an analysis of a financial statement as detective story or as a poem but probably we usually need to stick to the professional or academic writing. Otherwise I may need to be even more precise about the purpose, audience, models, schedules and format of my assignments. And perhaps also tell about my own resources or style of giving feedback.