diff --git a/include/quo-vadis.h b/include/quo-vadis.h
index debc5d1..e2c551f 100644
--- a/include/quo-vadis.h
+++ b/include/quo-vadis.h
@@ -186,7 +186,7 @@ qv_scope_group_rank(
  *
  */
 int
-qv_scope_ntasks(
+qv_scope_group_size(
     qv_scope_t *scope,
     int *ntasks
 );
diff --git a/src/fortran/quo-vadisf.f90 b/src/fortran/quo-vadisf.f90
index bf73e47..3df0849 100644
--- a/src/fortran/quo-vadisf.f90
+++ b/src/fortran/quo-vadisf.f90
@@ -197,13 +197,13 @@ function qv_scope_group_rank_c(scope, taskid) &
     end function qv_scope_group_rank_c
 
     integer(c_int) &
-    function qv_scope_ntasks_c(scope, ntasks) &
-        bind(c, name='qv_scope_ntasks')
+    function qv_scope_group_size_c(scope, ntasks) &
+        bind(c, name='qv_scope_group_size')
         use, intrinsic :: iso_c_binding, only: c_ptr, c_int
         implicit none
         type(c_ptr), value :: scope
         integer(c_int), intent(out) :: ntasks
-    end function qv_scope_ntasks_c
+    end function qv_scope_group_size_c
 
     integer(c_int) &
     function qv_scope_barrier_c(scope) &
@@ -350,14 +350,14 @@ subroutine qv_scope_group_rank(scope, taskid, info)
         info = qv_scope_group_rank_c(scope, taskid)
     end subroutine qv_scope_group_rank
 
-    subroutine qv_scope_ntasks(scope, ntasks, info)
+    subroutine qv_scope_group_size(scope, ntasks, info)
         use, intrinsic :: iso_c_binding, only: c_ptr, c_int
         implicit none
         type(c_ptr), value :: scope
         integer(c_int), intent(out) :: ntasks
         integer(c_int), intent(out) :: info
-        info = qv_scope_ntasks_c(scope, ntasks)
-    end subroutine qv_scope_ntasks
+        info = qv_scope_group_size_c(scope, ntasks)
+    end subroutine qv_scope_group_size
 
     subroutine qv_scope_barrier(scope, info)
         use, intrinsic :: iso_c_binding, only: c_ptr, c_int
diff --git a/src/quo-vadis.cc b/src/quo-vadis.cc
index 470237d..4a3ac5d 100644
--- a/src/quo-vadis.cc
+++ b/src/quo-vadis.cc
@@ -121,7 +121,7 @@ qv_scope_group_rank(
 
 // TODO(skg) Rename to qv_scope_group_size.
 int
-qv_scope_ntasks(
+qv_scope_group_size(
     qv_scope_t *scope,
     int *ntasks
 ) {
diff --git a/tests/qvi-test-common.h b/tests/qvi-test-common.h
index 8a76bb2..6d01283 100644
--- a/tests/qvi-test-common.h
+++ b/tests/qvi-test-common.h
@@ -82,18 +82,18 @@ qvi_test_scope_report(
         qvi_test_panic("%s (rc=%s)", ers, qv_strerr(rc));
     }
 
-    int ntasks;
-    rc = qv_scope_ntasks(scope, &ntasks);
+    int sgsize;
+    rc = qv_scope_group_size(scope, &sgsize);
     if (rc != QV_SUCCESS) {
-        ers = "qv_scope_ntasks() failed";
+        ers = "qv_scope_group_size() failed";
         qvi_test_panic("%s (rc=%s)", ers, qv_strerr(rc));
     }
 
     printf(
         "[%d] %s sgrank is %d\n"
-        "[%d] %s ntasks is %d\n",
+        "[%d] %s sgsize is %d\n",
         pid, scope_name, sgrank,
-        pid, scope_name, ntasks
+        pid, scope_name, sgsize
     );
 
     rc = qv_scope_barrier(scope);
diff --git a/tests/test-mpi-fortapi.f90 b/tests/test-mpi-fortapi.f90
index 2aa5a95..fd41ea0 100644
--- a/tests/test-mpi-fortapi.f90
+++ b/tests/test-mpi-fortapi.f90
@@ -19,7 +19,7 @@ program mpi_fortapi
 
 
     integer(c_int) info, n
-    integer(c_int) ntasks, sgrank, n_cores, n_gpu
+    integer(c_int) sgsize, sgrank, n_cores, n_gpu
     integer(c_int) vmajor, vminor, vpatch
     integer cwrank, cwsize, scope_comm, scope_comm_size
     type(c_ptr) scope_user, sub_scope
@@ -76,11 +76,11 @@ program mpi_fortapi
         error stop
     end if
 
-    call qv_scope_ntasks(scope_user, ntasks, info)
+    call qv_scope_group_size(scope_user, sgsize, info)
     if (info .ne. QV_SUCCESS) then
         error stop
     end if
-    print *, 'ntasks', ntasks
+    print *, 'sgsize', sgsize
 
     call qv_scope_group_rank(scope_user, sgrank, info)
     if (info .ne. QV_SUCCESS) then
diff --git a/tests/test-mpi-scopes-affinity-preserving.c b/tests/test-mpi-scopes-affinity-preserving.c
index 8cf4f37..7cbb68b 100644
--- a/tests/test-mpi-scopes-affinity-preserving.c
+++ b/tests/test-mpi-scopes-affinity-preserving.c
@@ -61,13 +61,13 @@ main(
 
     qvi_test_scope_report(base_scope, "base_scope");
 
-    int base_scope_ntasks;
-    rc = qv_scope_ntasks(
+    int base_scope_sgsize;
+    rc = qv_scope_group_size(
         base_scope,
-        &base_scope_ntasks
+        &base_scope_sgsize
     );
     if (rc != QV_SUCCESS) {
-        ers = "qv_scope_ntasks() failed";
+        ers = "qv_scope_group_size() failed";
         qvi_test_panic("%s (rc=%s)", ers, qv_strerr(rc));
     }
 
diff --git a/tests/test-mpi-scopes.c b/tests/test-mpi-scopes.c
index 6cff956..0f13698 100644
--- a/tests/test-mpi-scopes.c
+++ b/tests/test-mpi-scopes.c
@@ -90,13 +90,13 @@ main(
     }
     qvi_test_scope_report(base_scope, "base_scope");
 
-    int base_scope_ntasks;
-    rc = qv_scope_ntasks(
+    int base_scope_sgsize;
+    rc = qv_scope_group_size(
         base_scope,
-        &base_scope_ntasks
+        &base_scope_sgsize
     );
     if (rc != QV_SUCCESS) {
-        ers = "qv_scope_ntasks() failed";
+        ers = "qv_scope_group_size() failed";
         qvi_test_panic("%s (rc=%s)", ers, qv_strerr(rc));
     }
 
@@ -125,7 +125,7 @@ main(
     const int npieces = 2;
     const int gid = get_group_id(
         base_scope_rank,
-        base_scope_ntasks,
+        base_scope_sgsize,
         npieces
     );
     printf("[%d] base GID is %d\n", wrank, gid);
diff --git a/tests/test-mpi-threads.c b/tests/test-mpi-threads.c
index fa23f54..2d15d66 100644
--- a/tests/test-mpi-threads.c
+++ b/tests/test-mpi-threads.c
@@ -48,15 +48,15 @@ scope_report(
         qvi_test_panic("%s (rc=%s)", ers, qv_strerr(rc));
     }
 
-    int ntasks;
-    rc = qv_scope_ntasks(scope, &ntasks);
+    int sgsize;
+    rc = qv_scope_group_size(scope, &sgsize);
     if (rc != QV_SUCCESS) {
-        ers = "qv_scope_ntasks() failed";
+        ers = "qv_scope_group_size() failed";
         qvi_test_panic("%s (rc=%s)", ers, qv_strerr(rc));
     }
 
     printf("[%d] %s taskid is %d\n", pid, scope_name, taskid);
-    printf("[%d] %s ntasks is %d\n", pid, scope_name, ntasks);
+    printf("[%d] %s sgsize is %d\n", pid, scope_name, sgsize);
 
     rc = qv_scope_barrier(scope);
     if (rc != QV_SUCCESS) {
diff --git a/tests/test-omp.c b/tests/test-omp.c
index 52824cf..4fb0513 100644
--- a/tests/test-omp.c
+++ b/tests/test-omp.c
@@ -42,9 +42,9 @@ scopei_fill(
 ) {
     char *ers = NULL;
 
-    int rc = qv_scope_ntasks(sinfo->scope, &sinfo->size);
+    int rc = qv_scope_group_size(sinfo->scope, &sinfo->size);
     if (rc != QV_SUCCESS) {
-        ers = "qv_scope_ntasks() failed";
+        ers = "qv_scope_group_size() failed";
         qvi_test_panic("%s (rc=%s)", ers, qv_strerr(rc));
     }
 
diff --git a/tests/test-process-fortapi.f90 b/tests/test-process-fortapi.f90
index 9439139..331407e 100644
--- a/tests/test-process-fortapi.f90
+++ b/tests/test-process-fortapi.f90
@@ -18,7 +18,7 @@ program process_fortapi
 
 
     integer(c_int) info, n
-    integer(c_int) ntasks, sgrank, n_cores, n_gpu
+    integer(c_int) sgsize, sgrank, n_cores, n_gpu
     type(c_ptr) scope_user
     character(len=:),allocatable :: bstr(:)
     character(len=:),allocatable :: dev_pci(:)
@@ -29,11 +29,11 @@ program process_fortapi
         error stop
     end if
 
-    call qv_scope_ntasks(scope_user, ntasks, info)
+    call qv_scope_group_size(scope_user, sgsize, info)
     if (info .ne. QV_SUCCESS) then
         error stop
     end if
-    print *, 'ntasks', ntasks
+    print *, 'sgsize', sgsize
 
     call qv_scope_group_rank(scope_user, sgrank, info)
     if (info .ne. QV_SUCCESS) then
diff --git a/tests/test-process-scopes.c b/tests/test-process-scopes.c
index c1be4e5..4c162b7 100644
--- a/tests/test-process-scopes.c
+++ b/tests/test-process-scopes.c
@@ -64,13 +64,13 @@ main(void)
         qvi_test_panic("%s (rc=%s)", ers, qv_strerr(rc));
     }
 
-    int ntasks;
-    rc = qv_scope_ntasks(base_scope, &ntasks);
+    int sgsize;
+    rc = qv_scope_group_size(base_scope, &sgsize);
     if (rc != QV_SUCCESS) {
-        ers = "qv_scope_ntasks() failed";
+        ers = "qv_scope_group_size() failed";
         qvi_test_panic("%s (rc=%s)", ers, qv_strerr(rc));
     }
-    if (ntasks != 1) {
+    if (sgsize != 1) {
         ers = "Invalid number of tasks detected";
         qvi_test_panic("%s (rc=%s)", ers, qv_strerr(rc));
     }