Version 1.0, October 2026. 98 constructs in 18 families across 7 eras, with 18 imported theories below. Selecting a cell reveals its family, era, block, tier, and anchor works, each anchoring reference linking to the publisher’s page. Explore the 18 Family Deep Dives for granular sub-tables, or visit Resources to use the four interactive analytical tools.
Each cell: number, influence pips, block code, then symbol, construct, and anchor works
open frontier position
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Detached series · Theories imported from adjacent fields, each set near the families it feeds
Series
T
Imported Theories
13FC
Pp
Portfolio Planning
Family
1. Strategy and Positioning (I · Strategic Choice)
Era
Period 2: Planning, 1970s
Block
FC · Formulation, content
Tier
Major
Cell card
Description
Day evaluated product portfolio models such as the growth-share matrix as tools for allocating resources across business units and diagnosed the assumptions and limits of these planning devices.
Managerial Implications
Run the business as a portfolio: some units generate cash, some need investment, and some should be exited. Use a simple matrix of market attractiveness and competitive strength to make the allocation explicit and to stop every unit from claiming growth funding. The discipline matters more than the tool; the risk is treating a classification as a decision rather than as the start of one.
How to read. Down a column follows one research stream through time. Across a row shows what the field studied in an era. Color marks the strategy domain, after Morgan et al. (2019). Pips give an influence tier. Numbers run by era, then family. Placements, anchors, and tiers are editorial judgments, and anchors are entry points rather than a complete record of any stream. Anyone who uses or adapts this table is responsible for verifying its contents against the original works.
