![]() Diffusion: This refers to the results of one group transferring to another through the groups interacting and talking with or observing one another this can also lead to another issue called resentful demoralization, in which a control group tries less hard because they feel resentful over the group that they are in.Confounding: A situation in which changes in an outcome variable can be thought to have resulted from some type of outside variable not measured or manipulated in the study.Attrition: Participants dropping out or leaving a study, which means that the results are based on a biased sample of only the people who did not choose to leave (and possibly who all have something in common, such as higher motivation).Strict study protocol: Following specific procedures during the study so as not to introduce any unintended effects for example, doing things differently with one group of study participants than you do with another group.Randomization or random assignment: Randomly assigning participants to treatment and control groups, ensuring that there is no systematic bias between the research groups.Random selection: Choosing participants at random or in a manner in which they are representative of the population that you wish to study.Experimental manipulation: Manipulating an independent variable in a study (for instance, giving smokers a cessation program) instead of just observing an association without conducting any intervention (examining the relationship between exercise and smoking behavior).Blinding: Participants-and sometimes researchers-are unaware of what intervention they are receiving (such as using a placebo on some subjects in a medication study) to avoid having this knowledge bias their perceptions and behaviors, thus impacting the study's outcome.Internal Requirements can be created from an element's property sheet. Requirements that are defined inside an element can be moved external to a location specified by modeler thus creating a new element.Īn Internal Requirement will not be displayed on a diagram by default to ensure it is displayed you must set the compartment as visible either for the individual element or for all elements on the diagram. In the Project Browser, choose the location for the element to be inserted and select the 'New Element' toolbar option or 'Add Element' from the context menu.ĭisplay the context menu by right-clicking in the body of the window and select 'New Element' the element will be added to the list.ĭisplay the context menu by right-clicking in the body of the widow and select 'New Element' the element will be added to the list.Įnterprise Architect supports a wide range of ways of importing requirements from external sources. Using the context menu and selecting 'Add New Element' will result in a new element being created in the grid ready for details to be addedĭragging a Toolbox item onto the current diagramĭragging and dropping an item from a displayed toolbox page onto the current diagram will result in the element being added to the diagram. Methods for creating external requirements External Requirements are Requirements that will appear in the Project Browser and can be added to diagrams and viewed as separate elements with their own properties. Requirement analysts typically come from varied backgrounds and often have predilections about how they want to work so Enterprise Architect provides a wide range of ways of creating and managing requirements. When they are moved they are still linked to the original element. There is often contention between analysts and developers as to whether a requirement should be internal or external and Enterprise Architect provides a facility to move internal requirements to be external to the element. A modeler wanting to describe how a component should behave would use an internal requirement for the Component such as 'The editor must support Unicode'. ![]() An analyst who wants to define a user requirement such as the 'The system must allow bus schedules to be updated' would use an external requirement. These are called External Requirements, but the tool also allows requirements to be defined for a specific element, and these are called Internal Requirements. Enterprise Architect can support any type of requirement process and allows requirements to be defined as elements in the model.
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