AIAP Topic Courses·Management Consulting·11:51

Part 8: Issue Trees, Levels of Abstraction, and Root-Cause Analysis

Course instructor (unnamed, ex-McKinsey) Main trainer - IIT Madras engineer, ISB MBA; ITC, Boston Scientific, Paytm, ~4.5 years at McKinsey, now product partnerships at LinkedIn

▶LMS lesson

The short version

A supermarket tree: food vs non-food; food into perishable and long-life; long-life into shelf-stable and frozen, down to the 'atom'. No single right classification, but MECE at every level. An issue tree is an organised classification across levels of abstraction (0:00-0:06).
Profit = revenue and cost; the lines mean dependency. Reframed as root cause ('why is profit declining?') the branches become falling revenue and rising cost - the top question sets the meaning. Supply-chain delay tree: loading (manufacturing, packing, dock travel), en route (internal: trucks, drivers; external: traffic, weather), offloading; teaser hypothesis 'the problem is internal' (0:06-0:11).

At a glance, three clicks deep

Skim here first: the closed row is the glance, open is the study card with the key points and timestamps, and the ↓ link drops to that concept's full write-up below.

01Levels of abstraction and the issue treeLevels, each MECE, down to the atom.›

Levels, each MECE, down to the atom.

Abstraction and tree (0:00-0:06)

↓ Full write-up of this concept

02Reading the lines: profit trees and root-cause treesTop question defines branch meaning.›

The concepts in full

Levels of abstraction and the issue tree

Food, then long-life, then frozen, then the thing you cannot split further. Every level MECE, or the tree lies.

Supermarket: food vs non-food; food into perishable and long-life; non-food into flowers, personal care, miscellaneous; long-life into shelf-stable and frozen, and so on to the atom. There is no single correct classification, but each level must be MECE. An issue tree is an organised classification of concepts across levels of abstraction that simplifies a complex idea into buckets. Quiz: perishable, long-life, non-food is MECE.

Why it matters

The visual form of step 2.

This idea elsewherebuilds onMECE

Reading the lines: profit trees and root-cause trees

Change the question at the top and the same tree means something else. 'What drives profit' and 'why is profit falling' are different trees.

Profit splits into revenue and cost; the connecting lines mean 'driven by'. Reframe as root cause - 'what are the reasons for declining profit?' - and the branches become 'decrease in revenue' and 'increase in cost'. Know what you are solving before you draw. Supply-chain delay: loading at the factory (manufacturing, packing and assembly, travel to the dock, loading), en route (internal: trucks, drivers; external: traffic, weather, roads), offloading. Teaser: hypothesis 'the problem is internal', picked up in Part 9.

Why it matters

Stops trees being decorative.

This idea elsewherecontinuesHypotheses, Part 9

Tools referenced

Tool	Coverage	Moment	Context
McKinsey	explained		Subject of the lesson; nothing else demonstrated

Action items

Resources mentioned

Resources

docLesson page on the platform

Extraction notes

This page was built from an auto-generated transcript, which garbles product and people's names. Those were corrected silently in everything above and logged here for transparency. The warnings flag claims that were true on the recording day but change fast.

Transcript corrections applied

The transcript says	The trainer actually means
forms	firms
me see / messy	MECE
PNL	P&L

True on recording day — verify before relying

Evergreen method