The drawing technique of using dots instead of lines called stippling. Using lines instead of dots on the other hand is called hatching. Stippling involves placing individual dots across a surface in a pattern that will be identifiable. Individual dots are used to imply the shape, texture, or shadowing of a subject.
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The four models are press agentry model, public information model, two-way asymmetrical model and two-way symmetrical model. They described how public relations practitioners to be effectively and ethically practiced by offers a normative theory in two-way symmetrical model.
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