Les diagrammes de Venn sont un moyen utile de se représenter la logique booléenne. If you are beginning searcher you might find it worth your while to draw Venn diagrams before doing your searches-even advanced searchers use them from time to time. Textbook AND exercises textbooks AND exercises AND grade 8 However, in this case you will probably want to add something about your targeted age group-or your search results may contain many irrelevant (to you) sources. In this case, you don't need-or want-to do keyword searches for the general topic.įor example, in ERIC (an educational index), if you are looking for teaching tools in textbooks as well as suggested exercises, just search "textbooks and exercises"-there is no need to type "teaching" also. When you are doing advanced research, you may find yourself searching a database with a subject focus. Your result set would not include the items in the set below: If you had searched for all three, solar and houses and heating, your Venn diagram would look like this: It is also a good way to find additional terms you might want to search. Most of the time when you do a search, the records you pull up have several words that you did not specifically put in your search. Notice that the Venn diagram has a circle for "heating." Even though you did not search for "heating" you found a record with "heating" as one of the subject terms. This can be shown on a Venn diagram like this: One of the items you find is Solar Heating Systems for Houses: A Design Handbook for Solar Combisystems. Real life search: You do a search for items in the library catalog on solar houses. Scenario: He'll eat chips, but not if there are pretzels in the same bowl. >To find these results in one search in a library database she will need to do her search like this: (oil not water) or (water not oil).one search in a library database she will need to do her search like this: (oil not water) or (water not oil). Scenario: She is doing experiments, but she will never mix oil and water together. The majority of library researchers will never run across a database which uses the exclusive or. There is an exclusive or, but it is not used in most library databases. They don't care if the coasters we buy them are shaped like a circle or square.This cookout/potluck is great! I'll eat either the grilled or poached salmon-or both if there isn't enough of one or the other.We would like to attend a Spring training baseball game we don't care if it is major league or the minors-or if it is a match between the two.Major OR minor grilled OR poached circle OR square She need francs and pesos in coins for her collection.He needs information about running a farm with sheep, cattle, and chickens.Low AND cholesterol sheep AND cattle AND chickens coins AND (francs OR pesos) Venn diagrams are a useful way to visualize Boolean logic. Comment trouver des articles sur un sujet similaire.Comment trouver des articles de journaux et magazines.Comment demander de bonnes questions de références.Comment faire de la recherche en bibliothèque Toggle Dropdown.Examples of Journal Articles Versus "Web Sources".Identify Primary Sources in CSU's Online Catalog. How to Determine if the Library Owns a Journal.Designing Effective Research Assignments.
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