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ORGANIZATIONAL MEANING puts the referential information together into a coherent text. It is signaled by features such as deictics, repetition, groupings and by many other features in the grammatical structure of a text

SITUATIONAL MEANING concerns with factors such as the relationship between the speaker and the addressee, the time, setting etc

Explicit information is the information which is overtly stated by lexical items and grammatical forms. It is a part of the surface form

The implicit information is that for which there is no form but the information is part of the total communication intended  or assumed by the writer

In any text, the reference to certain THINGS, EVENT, ATTRIBUTES, and RELATION  will be left implicit. For example, if someone asks, “ how many people came?”  he answers “Ten”. In this context it is clear that the reference to people and came is left implicit