diff --git a/nCompiler/R/NC.R b/nCompiler/R/NC.R
index 0d4425c9..a8f791e7 100644
--- a/nCompiler/R/NC.R
+++ b/nCompiler/R/NC.R
@@ -98,7 +98,7 @@ nClass <- function(classname,
   # exportName: name of the R function to call the
   #    C/C++ function for a new object. Defaults to paste0("new_", classname)
   # interface ("full"): "full", "generic" or "none". First two: build interface. Fine-grained control possible in future.
-  # interfaceMembers(NULL): character vector of which members (variables and methods) to include. Default to all
+  # interfaceInclude(NULL): character vector of which members (variables and methods) to include. Default to all
   # depends (list()): Values for Cpp::depends.
   # inherit: list of C++ class inheritances (all public inheritance).
   #   If one is named "base", it will replace the inheritance from
@@ -150,7 +150,7 @@ nClass <- function(classname,
   # object by anything but a default constructor.
   compileInfo <- updateDefaults(
     list(exportName = NULL, interface = "full",
-         interfaceMembers = NULL,
+         interfaceInclude = NULL,
          depends = list(),
          inherit = list(),
          nClass_inherit = list(),
diff --git a/nCompiler/R/NC_InternalsClass.R b/nCompiler/R/NC_InternalsClass.R
index ab3c81f3..fbf0354f 100644
--- a/nCompiler/R/NC_InternalsClass.R
+++ b/nCompiler/R/NC_InternalsClass.R
@@ -18,7 +18,7 @@ NC_InternalsClass <- R6::R6Class(
     compileInfo = list(),
     inherit_base_provided = FALSE,
     # compileInfo will include interface ("full", "generic", or "none"),
-    # interfaceMembers, exportName, and depends
+    # interfaceInclude, exportName, and depends
     depends = list(),
     RcppPacket = NULL,
     isOnlyC = FALSE, ## somewhat redundant but perhaps convenient - TBD.
diff --git a/nCompiler/R/cppDefs_core.R b/nCompiler/R/cppDefs_core.R
index c203eea6..0e767d20 100644
--- a/nCompiler/R/cppDefs_core.R
+++ b/nCompiler/R/cppDefs_core.R
@@ -342,12 +342,22 @@ addGenericInterface_impl <- function(self) {
   while(!done) {
     NCint <- NCinternals(current_NCgen)
     NCcompInfo <- NCint$compileInfo
-    interfaceMembers <- NCcompInfo$interfaceMembers
-    useIM <- !is.null(interfaceMembers)
+    interfaceInclude <- NCcompInfo$interfaceInclude
+    interfaceExclude <- NCcompInfo$interfaceExclude
+    useIM <- !is.null(interfaceInclude) || !is.null(interfaceExclude)
+    if(useIM) {
+      if(!is.null(interfaceExclude) && !is.null(interfaceInclude)) {
+        stop("interfaceExclude and interfaceInclude cannot both be non-null.  Something is wrong.")
+      }
+      use_include <- !is.null(interfaceInclude)
+    }
     methodNames <- NCint$methodNames
     for(mName in methodNames) {
       if(mName %in% outputMethodNames) next
-      if(useIM && !(mName %in% interfaceMembers)) next
+      if(useIM) {
+        if(use_include && !(mName %in% interfaceInclude)) next
+        if(!use_include && (mName %in% interfaceExclude)) next
+      }
       NFint <- NFinternals(NC_get_Cpub_class(current_NCgen)$public_methods[[mName]])
       NFcompInfo <- NFint$compileInfo
       if(!useIM && !isTRUE(NFcompInfo$callFromR)) next
@@ -379,8 +389,16 @@ addGenericInterface_impl <- function(self) {
     # I am belaboring what could be done with unique or setdiff to be more
     # sure that order is preserved aligning fieldNames and cpp_fieldNames
     new_fieldNames <- NCint$symbolTable$getSymbolNames()
-    do_interface <- NCint$symbolTable$getSymbols() |>
-      lapply(\(x) isTRUE(x$interface)) |> unlist()
+    if(!useIM || !use_include) 
+      do_interface <- NCint$symbolTable$getSymbols() |>
+        lapply(\(x) isTRUE(x$interface)) |> unlist()
+    if(useIM) {
+      if(use_include) {
+        do_interface <- (new_fieldNames %in% interfaceInclude)
+      } else {
+        do_interface <- do_interface & !(new_fieldNames %in% interfaceExclude)
+      }
+    }
     new_fieldNames <- new_fieldNames[do_interface]
     new_fieldNames <- new_fieldNames[!(new_fieldNames %in% fieldNames)]
     fieldNames <- c(fieldNames, new_fieldNames)
diff --git a/nCompiler/tests/testthat/nCompile_tests/test-interfaceMemberControl.R b/nCompiler/tests/testthat/nCompile_tests/test-interfaceMemberControl.R
new file mode 100644
index 00000000..d55b36a9
--- /dev/null
+++ b/nCompiler/tests/testthat/nCompile_tests/test-interfaceMemberControl.R
@@ -0,0 +1,61 @@
+library(nCompiler)
+library(testthat)
+
+test_that("compileInfo$interfaceInclude and interfaceExclude work", {
+  nc <- nClass(
+    Cpublic = list(
+      a = 'numericScalar',
+      b = 'numericScalar',
+      foo = nFunction(
+        function(){}
+      ),
+      foo2 = nFunction(
+        function() {}
+      )
+    ),
+    compileInfo = list(interfaceInclude = c('a','foo'))
+  )
+  cppDef <- nCompile(nc, control = list(return_cppDefs = TRUE))
+  RcppPacket <- nCompiler:::cppDefs_2_RcppPacket(cppDef[[1]], "filename")
+  expect_true(grepl('\"a\"',RcppPacket$cppContent$body)|>sum() == 1)
+  expect_true(grepl('\"b\"',RcppPacket$cppContent$body)|>sum() == 0)
+  expect_true(grepl('\"foo\"',RcppPacket$cppContent$body)|>sum() == 1)
+  expect_true(grepl('\"foo2\"',RcppPacket$cppContent$body)|>sum() == 0)
+
+  nc <- nClass(
+    Cpublic = list(
+      a = 'numericScalar',
+      b = 'numericScalar',
+      foo = nFunction(
+        function(){}
+      ),
+      foo2 = nFunction(
+        function() {}
+      )
+    ),
+    compileInfo = list(interfaceExclude = c('b','foo2'))
+  )
+  cppDef <- nCompile(nc, control = list(return_cppDefs = TRUE))
+  RcppPacket <- nCompiler:::cppDefs_2_RcppPacket(cppDef[[1]], "filename")
+  expect_true(grepl('\"a\"',RcppPacket$cppContent$body)|>sum() == 1)
+  expect_true(grepl('\"b\"',RcppPacket$cppContent$body)|>sum() == 0)
+  expect_true(grepl('\"foo\"',RcppPacket$cppContent$body)|>sum() == 1)
+  expect_true(grepl('\"foo2\"',RcppPacket$cppContent$body)|>sum() == 0)
+
+  nc <- nClass(
+    Cpublic = list(
+      a = 'numericScalar',
+      b = 'numericScalar',
+      foo = nFunction(
+        function(){}
+      ),
+      foo2 = nFunction(
+        function() {}
+      )
+    ),
+    compileInfo = list(interfaceExclude = c('b','foo2'),
+                       interfaceInclude = c('a', 'foo'))
+  )
+  cat("Expecting error that interfaceExclude and interfaceInclude cannot both be non-null.\n")
+  expect_error(cppDef <- nCompile(nc, control = list(return_cppDefs = TRUE)))
+})