Obvious
    Know knows - problems and answers are clearly,needn’t too much expertise.
    Best approach: sence-categorise-respond

    Complicated
    Know unknows - know about the problem，but it takes work to answer them.
    Best approach：sence-analyse-respond

    Complex
    Unknown unknowns - we don’t yet know enough about problems.
    Best approach：experiment to learn about the problem until to Complicated Domain

    Chaotic
    Things aren’t under control - cause and effect relationships are unclear.
    Best approach：establish some stability to contain the situation until to Complex Domain

    Know the situation reason Is the situation under control? How much do you know about it? Does solving it require expert knowledge? →Domain
    YES YES MORE NO Obvious
    YES YES MORE YES Complicated
    NO YES LESS YES Complex
    NO NO LESS YES Chaotic