a. Do you think it is more effective to search the invisible web (databases) than using search engines, meta-search or subject directories? Why?
Meta search engine is a good way of finding popular sites that most people visit, as most of them are rank according to popularity. If the research topic is hot, meta search engine is definitely the best search engine to do research on.
Subject directory is a good way of finding information of certain subject only, it filters out all the unrelated sites that are unrelated to the search. Researching using subject directory is definitely useful to find certain related topic.
b. Will you use the invisible web (databases) for research in your own respective Diplomas? Why?