diff --git a/R/ontoSummarize.R b/R/ontoSummarize.R
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+#' Groups ontology terms by the child term of a provided "parent" they fall
+#' under
+#' 
+#' @import rols
+#' @import stringr
+#'
+#' @param parent Character; Term to use as parent of summarized children
+#' @param descendants Character vector; Terms to summarize as children of parent
+#' @param ontology Character; Ontology database ID
+#' @return A dataframe containing the descendants summarized into groups. Name
+#' of each group is the child of the parent that the descendants are grouped
+#' under. Both IDs and labels of the ontology terms are provided.
+#' 
+#' @examples
+#' ontology <- "ncit"
+#' parent <- "NCIT:C17049"
+#' descendants <- c("NCIT:C44265", "NCIT:C77811", "NCIT:C43856",
+#'                  "NCIT:C43672", "NCIT:C2991", "NCIT:C43860")
+#' ontoSummarize(parent, descendants, ontology)
+#' 
+ontoSummarize <- function(parent, descendants, ontology) {
+    # Initialize ontology
+    ontob <- Ontology(ontology)
+    
+    # Get children of parent to establish groups
+    pterm <- Term(ontob, parent)
+    pchildren <- names(termLabel(children(pterm)))
+    
+    # Get ancestors of all descendants
+    dancs <- sapply(descendants, 
+                  function(x) names(termLabel(ancestors(Term(ontob, x)))),
+                   simplify = FALSE,
+                   USE.NAMES = TRUE)
+    
+    dall <- mapply(c, names(dancs), dancs)
+    
+    # Group descendants by children of parents
+    dgroups <- sapply(dall, function(x) x[which(x %in% pchildren)],
+                      simplify = FALSE,
+                      USE.NAMES = TRUE)
+    dgroups[lengths(dgroups) == 0] <- paste0("Not a descendant of ", parent)
+    
+    finalgroups <- split(names(dgroups), unname(unlist(dgroups)))
+    collapse_groups <- unlist(unname(lapply(finalgroups, function(x)
+        paste(x, collapse = ";"))))
+    
+    ids_to_convert <- unique(c(names(finalgroups), unlist(unname(finalgroups))))
+    extract_ids <- str_match(ids_to_convert, "NCIT:.*$")
+    termnames <- unlist(lapply(extract_ids, function(x) termLabel(Term(ontob, x))))
+    names(termnames) <- extract_ids
+    group_names <- str_replace_all(names(finalgroups), termnames)
+    original_names <- str_replace_all(collapse_groups, termnames)
+    
+    finalframe <- data.frame(group_ids = names(finalgroups),
+                             group_names = group_names,
+                             original_ids = collapse_groups,
+                             original_names = original_names)
+    
+    return(finalframe)
+}