Compare the hierarchy location of two SNOMED CT concepts
From any view in the SCT Browser, press on thePerspective
button in the header bar to see a drop-down options list of available perspectives:
Full
Comparing
Comparing hierarchy
Responsive (tablets, phones)

Select Comparing hierarchy
to switch the presentation.

Perspective: Comparing hierarchy
maintains the browser header bar, but changes to show two side-by-side Taxonomy panels, with a Search panel below the left-hand Taxonomy panel and a Concept Details panel below the right-hand Taxonomy panel.
The Search panel is identical in features and behaviour to that of Perspective: Full
, primarily for the purpose of populating the two Taxonomy panels, although it can also be used to load and view concepts in the Concept Details panel just as in Perspective: Full
.
Reloading clears Perspective: Comparing hierarchy
Reloading the page will reset the SCT Browser to the Perspective: Full
default presentation.

In the Search panel, find the first concept to be compared (as described in Find the SCTID for a known concept term or Find the FSN or PT for a known concept SCTID).
Selecting a search result will load that concept into the Concept Details panel, within which all the context details tabs are available, as in the Perspective: Full
presentation.

In the Search Results list, press and hold the result row for the first concept to be compared. The selected row will be highlighted in blue, and a "Drag this" tooltip will appear.

Whilst holding the cursor selection, drag the selected item onto the left-hand Taxonomy panel.
Whilst dragging, the concept FSN term will appear alongside the cursor arrow.

When the cursor is over the Taxonomy panel "drop-zone" a drop-target symbol will appear.
Release the cursor hold to "drop" the concept.
Following a search result link does not change Taxonomy focus
Following a search result in `Perspective: Comparing hierarchy` changes the focus concept in the Concept Details panel, but does not change the focus concept in a Taxonomy panel.
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The left-hand Taxonomy panel will now show a hierarchical tree view focused on the dropped concept.
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Now use the Search panel again to find the desired comparison concept, and repeat the same steps to select, drag and drop, but this time drag the comparison concept to the right-hand Taxonomy panel.
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The two Taxonomy context panel hierarchies can now be compared side-by-side.
Each hierarchy can be navigated individually (as described in [Browse SNOMED CT International Edition concepts](Browse-SNOMED-CT-International-Edition-concepts_154250246.html)).
Following a concept link in either Taxonomy panel will load that concept into the Concept Details panel, allowing deeper analysis via its context details tabs if needed.
The two Concept Details context tabs can be navigated independently whilst retaining their focus concept for side-by-side comparisons of the information in each context tab.
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Following another search result will load that concept into the Concept Details panel, regardless of the current status of the Taxonomy panels, which remain unchanged until either their hierarchy navigation is used, or another concept is dragged and dropped to change their focus.
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Once done with comparisons, select `Full` in the header bar `Perspective` button drop-down options list to switch back to `Perspective: Full`.
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