1. bias are factors that make a man not used to the idea. All men are thought to things differently
2. impairments of health. Impairment of health, whether physical or mental, will contribute to the effectiveness of cognitive decline, such as headaches, make something out of it. When a cold will cause headaches think less convenient. Or even coughing, sneezing, etc.
3. abusive environment. Noisy environments Crowded, noisy, hot weather will cause lack of concentration in the mind. The idea is not clear
4. Lack of language skills We need to use language to convey thoughts and ideas. If using bad language, such as using obscure words to make people think and express ideas clearly. The idea was to stay in a narrow band
5. The lack of knowledge and experience To think everything needs to know basis.
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