had we only tested four participants. Until you become experienced at testing, employing more participants decreases the probability you will miss an important problem, while providing additional opportunities to practice your moderating skills.
If you find you have very limited time and budget, you may want to institute a practice of "discount" usability testing, in which you would run several small, iterated usability tests over time. That is, conduct a test with 4 or 5 participants from one cell and one or two conditions, incorporate the findings into the interface, and then conduct another test with a similar set of participants and conditions. Over three or four tests, you end up with a large sample of participants, but the development team is able to accommodate changes in between tests.
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