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John Bollinger: Source-Scoped Study Note
Band position is not an automatic trade. An editorial study assignment with explicit source limits, not a hidden rulebook.
What the source can support
Bollinger's official rules distinguish a band tag from a self-sufficient buy/sell signal and describe parameter defaults as defaults. We do not reproduce the full rule list.
Original exercise for this learning question
Describe a fictional price location relative to bands without immediately assigning a reversal. Write an alternative interpretation and the additional evidence needed to distinguish it. Explain which chosen settings belong to the illustration, not a universal prescription.
Work without a live account. Record the original reference, the observation boundary and the first answer before examining a later result. When a definition is unclear, mark the uncertainty; do not supply a favourable fact from hindsight or attribute your own invented parameter to the author.
The distinction to explain
The use of standard deviation in a chart tool does not by itself justify a normal-distribution probability claim about future prices.
Artifact and transfer review
Declared settings, observation versus inference and a fresh non-example.
Retain the baseline and correction as separate artifacts. For a fresh task, explain what was supplied, what you assumed and what remains unobserved. This review concerns your understanding of an evidence boundary, not the original trader's current performance or a reproduction of a private system.
Source Identity
Original operator, author or publisher reference
The scope above identifies whether the reference is an authored resource, provider interpretation, institutional description or catalogue identity. It does not imply paid access, a new account audit or a complete modern method.
Public notes versus private courses / Observation before hindsight / Study library
Learning Concepts and Fresh Cases
A band is calculated from a declared input and convention; touching it is an observation, not by itself an account instruction. Relative position within bands, band width and a proposed squeeze interpretation answer different questions. The original author's rules need to be read in their context.
Use two invented sequences with the same final price but different prior variation. Explain why a band-related interpretation can differ. Record inputs and settings, and avoid translating an assumed statistical relationship into a guaranteed probability about future prices.
Retain squeeze, walking the bands, W/M patterns, percent-B and BandWidth as topic identities. For transfer, compare a qualifying source-defined illustration with a lookalike. A useful answer explains the context and limitation; it does not claim that a tag predicts a reversal or that a default setting is optimal everywhere.
Retained Vocabulary Reading Trail
Bollinger Bands, the Squeeze, walking the bands, W-bottoms, M-tops, %B indicator, BandWidth, adaptive support/resistance, volatility cycles.
This vocabulary preserves the earlier topic coverage. It is a list of research leads, not a verified private rulebook. Any numerical setting or author-specific parameter needs its original definition and scope before being used or attributed.