Answer to Question 1
(a) You wouldn't want to use repeated measures in developmental, longitudinal research. If you wanted to study people of very different ages because you would have to wait years.
(b) You can't use repeated measures designs with participant (subject) variables.
(c) Sequence and order effects may cause problems when the same person is tested in one condition with the result that performance is affected later, in another condition.
Answer to Question 2
a. confidentiality and anonymitythere must be a guarantee that nobody but the researchers will be able to see the data (confidentiality) or to find out who participated (confidentiality). Security on the internet isn't guaranteed
b. informed consentalthough a person could stop filling out a survey at any time, there is no guarantee that a person will feel that he or she can stop
c. debriefinginternet research may make debriefing information available, but participants may not make use of it
d. compensatory followupif there are any negative effects of participation, the researcher may never know.
e. theft of ideas or plagiarismunscrupul ous researchers may steal others' ideas and claim them for their own; because of the public nature of the internet, the issues could become cloudy
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