- Source: Issue tree
An issue tree, also called logic tree, is a graphical breakdown of a question that dissects it into its different components vertically and that progresses into details as it reads to the right.: 47
Issue trees are useful in problem solving to identify the root causes of a problem as well as to identify its potential solutions. They also provide a reference point to see how each piece fits into the whole picture of a problem.
Types
According to professor of strategy Arnaud Chevallier, elaborating an approach used at McKinsey & Company, there are two types of issue trees: diagnostic ones and solution ones. Diagnostic trees break down a "why" key question, identifying all the possible root causes for the problem. Solution trees break down a "how" key question, identifying all the possible alternatives to fix the problem.
Rules
Four basic rules can help ensure that issue trees are optimal, according to Chevallier:
Consistently answer a "why" or a "how" question
Progress from the key question to the analysis as it moves to the right
Have branches that are mutually exclusive and collectively exhaustive (MECE)
Use an insightful breakdown
The requirement for issue trees to be collectively exhaustive implies that divergent thinking is a critical skill.
Applications
= In management interviews
=Issue trees are used to answer questions in case interviews for management consulting positions. A quantitative type of question, the market sizing question, requires the interviewee to estimate the size of a data group such as a specific segment of a population, an amount of objects, a company's revenues, or similar. The candidates are expected to use a structured and logical method of arriving at their answer, and using an issue tree provides a diagram to aid the candidate's logical reasoning. Issue trees are used for other types of case interview questions as well.
See also
Fault tree analysis
Five whys
Horizon scanning
Ishikawa diagram
Root cause analysis
Why–because analysis
References
Further reading
Chevallier, Arnaud (11 April 2011). "Don't get lost in the terminology". powerful-problem-solving.com. Retrieved 2018-10-06. Issue trees, issue maps, logic trees, how trees, why trees, diagnostic trees, solution trees, decision trees, fact trees, hypothesis trees... How should you call your trees?... Call your tree what you want it to do.
Chevallier, Arnaud (19 February 2011). "Use your issue tree as a decision tree". powerful-problem-solving.com. Retrieved 2018-10-06.
Conn, Charles; McLean, Robert (2019). Bulletproof problem solving: the one skill that changes everything. Hoboken, NJ: John Wiley & Sons. ISBN 9781119553021. OCLC 1047803356.
Friga, Paul N. (2009). "Develop the issue tree". The McKinsey engagement: a powerful toolkit for more efficient & effective team problem solving. McKinsey trilogy. Vol. 3. New York: McGraw-Hill. pp. 91–96. ISBN 978-0071497411. OCLC 166390293.
Garrette, Bernard; Phelps, Corey; Sibony, Olivier (2018). Cracked it!: how to solve big problems and sell solutions like top strategy consultants. Cham: Palgrave Macmillan. doi:10.1007/978-3-319-89375-4. ISBN 9783319893747. OCLC 1028620732.
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