System thinking (excellent introduction by Ackoff youtube.com/watch?v=OqEeIG8aPPk must watch it you won't regret it'll make your day and even life), Deming PDSA (also known as PDCA in case you don't know Jeff Sutherland says PDCA is used by Scrum), Deming SoPK (System of Profound Knowledge).
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System thinking (excellent introduction by Ackoff youtube.com/watch?v=OqEeIG8aPPk must watch it you won't regret it'll make your day and even life), Deming PDSA (also known as PDCA in case you don't know Jeff Sutherland says PDCA is used by Scrum), Deming SoPK (System of Profound Knowledge).