# Compare the hierarchy location of two SNOMED CT concepts
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From any view in the SCT Browser, press :chevron-down: on thePerspective button in the header bar to see a drop-down options list of available perspectives:
Full
Comparing
Comparing hierarchy
Responsive (tablets, phones)
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| Select `Comparing hierarchy` to switch the presentation. |
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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.
Panel sizes can be adjusted
The relative sizes of the four panels can be adjusted by pressing and dragging their grey border bars.
This can be useful to maximise a particular panel if the default sizes cause some desired viewing content to be hidden whilst comparing.
The panels can also be scrolled vertically independently to alleviate such situations.
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.
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| 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. |
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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.
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When the cursor is over the Taxonomy panel "drop-zone" a drop-target :circle-plus: symbol will appear.
Release the cursor hold to "drop" the concept.
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{% hint style="warning" %}
**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.
{% endhint %}
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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.
{% hint style="info" %}
**Drag and drop can be used across the Taxonomy panels**
If desired, a concept in one *Taxonomy* panel can also be dragged and dropped into the other to change its focus concept.
In selecting it for drag and drop, that concept will also be loaded into the *Concept Details* panel.
{% endhint %}
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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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