If I reviewed well the possibilities of Moodle tests, there is no such structure, that support simple writing a single statement by the student, and assesment this for teacher. Is this constructivist approach, so I expect that student can act more elasticly, than multiple question and short answer, which is in my opinion very catching and making student dubious - you MUST give a right ONE word. Even s/he knows what's going on, it is possibility to fail, because it is not EXACTLY, as teacher wants. Is this good? No.
And I expect that software can support such point of view, because it can do much and save teachers' time and quator forests.
Martin writes: "what web structures and interfaces encourage or hinder participants to engage in reflective dialogue within a community of learners - by reading openly, reflecting critically and writing constructively?" _writing constructively_ is MORE than guessing what teacher has inputed into text field, to make me a good learner.
I look for :
Question: What are sides of the world?
Answer: [N, S, W, E, topward, downward]
This answer could not be based on Short Answer, Single Choice, Multiple Choice.
And I look for assesment as comparison of answers for teacher which can be easier to compare and asses:
Question: What are sides of the world?
Answer1: [N, S, W, E, topward, downward] Points: [choose how many]
Answer2: [N, S, W, E] Points: [choose how many]
Answer3: [sth else..... ] Points: [choose how many]
I hope this could be of inspiration.