In DIKW, data comes from the observation and recording of targets, which is the description of time, space, events and other concepts or objects, and it is a discrete, irrelevant, complicated and meaningless thing. Data is not available until it is in a useful form. On the whole, data can be divided into facts, signals and symbols. From a factual point of view, if all facts are true and correct observations, then not all data can be called facts. Meaningless, erroneous and non-perceptual data are not facts; From the signal point of view, if the signal can be perceived by human perception system, then the data can also be defined as energy waves received by human perception system or particles such as light, heat and sound. From the perspective of symbols, data is a symbol used to save or record scenes and events. For example, age, name, etc. are data units used to record people's attributes, and are recording symbols. Therefore, age and name are not knowledge, but just a kind of data, which has no other functions except the function of recording. Information emphasizes the significance and goal of data. The significance and goal of information determines that it can provide information content support for users' decisions and actions. In addition, information is structured data, which means that information can be combined with specific goals and scenes, and its value and significance can be displayed in the combination of scenes and goals. Information is also symbolic and subjective. Knowledge is an obscure concept that is difficult to describe and define, and it is information after being processed, organized and applied. Knowledge comes from information, but it is not a simple accumulation of information, but a judgment based on past experience. Therefore, information is not the parent set of knowledge. Wisdom is more enlightening than knowledge. Compared with knowledge, wisdom emphasizes its revelation, evaluation and understanding of knowledge. Wisdom can be used to improve effectiveness and value, which is different from knowledge. Wisdom emphasizes the ability in philosophy of life. The steps of DIKW are shown in Figure 2.2, and data are accumulated through original observation. On the basis of the analysis, information is obtained, which can be used to answer simple descriptive questions. Knowledge plays a guiding role in action; After understanding knowledge, eliminating falsehood and preserving truth, wisdom is finally formed. Wisdom is cognition about the future; Data, information and understanding are cognition about the past. It is worth noting that the situation, context and receiver are very important for the transmission of data, information and knowledge. A piece of processed data may be simple information for A, but it may only be data for B. The processing information A output by system A may be the original data for another system B. Therefore, the use of DIKW needs to be combined with specific scenes and contexts.
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