Discuss how David and Susan analyzed the situation, arriving at the theory that the lead glaze on the pottery was responsible for their symptoms.

You have not provided the complete question here. What are
the symptoms of David and Susan that you are referring to and what was the analysis done
by them.

As you have mentioned lead glaze, it can be
assumed this question is related to lead poisoning. Lead poisoning does not have any
immediate effects unless lead is taken as a very large dose. Poisoning over a prolonged
period of time, in adults, causes symptoms that include high blood pressure, reduction
in mental functioning, memory loss, infertility in men, and miscarriages in
women.

Lead glaze is often used in pottery as it very
attractive to look at. If the pots are baked at high temperatures and the glaze properly
formulated the chances of lead leaching into food stored in them is almost zero. On the
other hand, when glazing is not done properly, it can lead to lead poisoning. How much
lead leaches into the foods depends on the type of food stored, how often the pots the
heated and if there is high acidity.