Unit flow (Preview) - Unit lookup

The Unit Flow filter supports three different ways of identifying units, based on when a unit is first observed relative to the selected filter date and time range.
The illustrations show how units are included or excluded depending on the chosen unit lookup method. 

How to read the illustrations

• Y-axis – Serial numbers, one row per unit
• Rectangle – A process the unit passed through
• Process label (for example P1, P2, P3)  – Identifies the specific process.
• Green – Process included in the result
• Red – Process excluded from the result
• Orange highlighted area – Applied filter date and time range

Unit first seen (UTC)

This option identifies units based on the very first time the unit appears. This behavior is consistent with how units are identified across WATS and is often referred to as the unit’s birth time. A unit is included only if its first ever occurrence falls within the selected filter date and time range.

Result: SN002, SN004, SN006

Unit first seen in process (UTC)

This option looks at the unit’s complete history, both before and after the selected filter date and time range.
A unit is included only if it’s very first process entry occurs within the filter date and time range

Result: SN002, SN004, SN005, SN006

 

Unit seen (UTC)

This option looks at the unit’s complete history, and identifies units based on any occurrence within the selected filter date and time range. A unit is included if it appears at least once within the filter date and time range, regardless of whether it was seen earlier or later. This behavior supports scenarios such as RMA analysis.

Result: SN001, SN002, SN004, SN005, SN006

Why do I see fewer processes and units when using Unit first seen in process and Unit seen compared to Unit first seen?

You may see fewer processes and units when using Unit first seen in process and Unit seen due to the combined effect of the To date filter and the Max units setting.

When Max units is defined, the filter returns only the most recent reports, up to the specified maximum number of unique units. In larger datasets, this can cause some units and their associated processes to be excluded if they fall outside the most recent set of results.

As a result, parts of the flow may appear missing because older units are effectively cut off by the Max units limit in combination with the selected date range.

Tip: To include more processes and units, increase the Max units value or adjust the To date range to ensure all relevant data is captured.