Method

Understand PHASE, read a chart.

Short documentation in three parts: understand what the method is for, read a chart sign by sign, use PHASE in your line of work. Each page stands on its own.

Understand

Why PHASE

What the reader of an investigation report cannot see, and why PHASE puts the flight on a single timeline.

Reading a chart

Time on the horizontal axis, ten strata on the vertical, and a way of reading aloud that follows information from the bottom up.

The signs

Three shapes, three fills and a few marks; each sign carries one piece of information only.

The moment T

The cursor gathers everything active at a given moment; moved along, it shows information travelling up and the delays in between.

The record

The timeline shows, the record establishes; behind every shape sit the source, the status, the level of evidence, the reservations and the relations.

The Control Index

An experimental reading of temporal control, how far ahead of the aircraft the crew is, placed by hand segment by segment.

Uses

Debriefing, EBT/CBTA training, flight safety with FDM and ASR, research; one case, different questions.

Status and limits

What PHASE is not, what is established and what is not, and the call for research partners.

Glossary

The words of the method, with their definitions.

Shapes

Diamondwhat happens at an instant
Barwhat lasts; length is time
Deltadeviation from the expected (Error stratum)

Fills

Whiteprotects or recovers
Greyweakens
Hatchedneither

Marks

Dashednot known to the crew
AbcItalicstatus not established
Three chevronscontinues beyond the chart
One chevronend set by rule
Cutfrom here, something changes
Cursorinstant T

No colour on objects, no severity scale. The length of a bar expresses neither intensity nor severity.