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+====== Incremental Building ======
+If you are using GLI, you need to select "Minimal Rebuild" on the Create Pane.
+If you are building on the command line, you can use incremental-rebuild.pl, incremental-import.pl and incremental-buildcol.pl in place of full-rebuild.pl, import.pl and buildcol.pl.
+**Incremental importing:** New documents will be imported. Modified documents will be re-imported. Deleted documents will be removed from the collection.
+If metadata has changed, then documents will be reimported.
+Important note for collection design: GLI can notice that metadata in a folder has been
+added/changed, but it is not smart enough to tell which documents in the folder have changed
+metadata. Therefore, if metadata in a folder has changed (including new metadata being added),
+then all documents in that folder will be reimported. This means that if you have all your
+documents in the top level import folder, adding new metadata or changing any metadata for
+any document will result in **all** documents being reimported. If you intend to do incremental
+import, then please organize your documents into subfolders. That way modifying metadata for
+some documents won't result in all other documents being reimported.
+**Incremental indexing:** Currently only the Lucene indexer can do incremental indexing.
+If you are using MG/MGPP then a full buildcol pass will be done, even if incremental-buildcol.pl
+is used.
+If collection design has changed, then you will need to do a full rebuild. Changes to plugin
+options, and some import options will necessitate a full import.
+Changes to search indexes, partition indexes, browsing classifiers will necessitate a full
+buildcol.
+Note, changes on the Format pane do not require a rebuild at all.
+See [[en:developer:incremental_building|this page]] for some information about the code involved with incremental building.