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porter strategy 7s market research qualitative tools interview coso risk management 丌亘 賵 賮丕囟賱丕亘 賲丿蹖乇蹖鬲 乇蹖爻讴 at&t marketing value chain internal analysis csf bsc strategy map external analysis emirates 丿蹖噩蹖鬲丕賱 賲丕乇讴鬲蹖賳诏 digital marketing 乇丕丿蹖賵 鬲賱賵蹖夭蹖賵賳 爻丕毓鬲 丕爻鬲賮丕丿賴 乇爻丕賳赖 鬲亘賱蹖睾丕鬲 media landscape iran 丕蹖賳鬲乇賳鬲 丕毓鬲賲丕丿 亘賴 乇爻丕賳赖 乇賮鬲丕乇 乇爻丕賳赖 丕蹖 乇賵夭賳丕賲赖 乇爻丕賳赖 media systematic sampling random sampling cochran equation sample size focus group