diff --git a/algorithms_cpp/include/embb/algorithms/internal/for_each-inl.h b/algorithms_cpp/include/embb/algorithms/internal/for_each-inl.h
index a6cd15f..8d9e034 100644
--- a/algorithms_cpp/include/embb/algorithms/internal/for_each-inl.h
+++ b/algorithms_cpp/include/embb/algorithms/internal/for_each-inl.h
@@ -107,6 +107,8 @@ void ForEachRecursive(RAI first, RAI last, Function unary,
   difference_type distance = std::distance(first, last);
   if (distance == 0) {
     return;
+  } else if (distance < 0) {
+    EMBB_THROW(embb::base::ErrorException, "Negative range for ForEach");
   }
   unsigned int num_cores = policy.GetCoreCount();
   if (num_cores == 0) {
diff --git a/algorithms_cpp/include/embb/algorithms/internal/merge_sort-inl.h b/algorithms_cpp/include/embb/algorithms/internal/merge_sort-inl.h
index 7e7b0f7..a56d582 100644
--- a/algorithms_cpp/include/embb/algorithms/internal/merge_sort-inl.h
+++ b/algorithms_cpp/include/embb/algorithms/internal/merge_sort-inl.h
@@ -213,23 +213,24 @@ class MergeSortFunctor {
   }
 };
 
-}  // namespace internal
-
 template<typename RAI, typename RAITemp, typename ComparisonFunction>
-void MergeSort(
+void MergeSortIteratorCheck(
   RAI first,
   RAI last,
   RAITemp temporary_first,
   ComparisonFunction comparison,
   const embb::mtapi::ExecutionPolicy& policy,
-  size_t block_size
+  size_t block_size,
+  std::random_access_iterator_tag
   ) {
   typedef typename std::iterator_traits<RAI>::difference_type difference_type;
-  typedef internal::MergeSortFunctor<RAI, RAITemp, ComparisonFunction>
+  typedef MergeSortFunctor<RAI, RAITemp, ComparisonFunction>
     functor_t;
   difference_type distance = std::distance(first, last);
   if (distance == 0) {
-    EMBB_THROW(embb::base::ErrorException, "Distance for ForEach is 0");
+    return;
+  } else if (distance < 0) {
+    EMBB_THROW(embb::base::ErrorException, "Negative range for MergeSort");
   }
   unsigned int num_cores = policy.GetCoreCount();
   if (num_cores == 0) {
@@ -247,7 +248,7 @@ void MergeSort(
                "Not enough MTAPI tasks available to perform merge sort");
   }
 
-  internal::BlockSizePartitioner<RAI> partitioner(first, last, block_size);
+  BlockSizePartitioner<RAI> partitioner(first, last, block_size);
   functor_t functor(0,
                     partitioner.Size() - 1,
                     temporary_first,
@@ -264,7 +265,16 @@ void MergeSort(
   task.Wait(MTAPI_INFINITE);
 }
 
-// @NOTE: Why is there no type guard for RAI?
+}  // namespace internal
+
+template<typename RAI, typename RAITemp, typename ComparisonFunction>
+void MergeSort(RAI first, RAI last, RAITemp temporary_first,
+  ComparisonFunction comparison, const embb::mtapi::ExecutionPolicy& policy,
+  size_t block_size) {
+  typedef typename std::iterator_traits<RAI>::iterator_category category;
+  internal::MergeSortIteratorCheck(first, last, temporary_first, comparison,
+    policy, block_size, category());
+}
 
 }  // namespace algorithms
 }  // namespace embb
diff --git a/algorithms_cpp/include/embb/algorithms/internal/quick_sort-inl.h b/algorithms_cpp/include/embb/algorithms/internal/quick_sort-inl.h
index 4ce296f..1b4bb2f 100644
--- a/algorithms_cpp/include/embb/algorithms/internal/quick_sort-inl.h
+++ b/algorithms_cpp/include/embb/algorithms/internal/quick_sort-inl.h
@@ -186,16 +186,19 @@ class QuickSortFunctor {
   QuickSortFunctor(const QuickSortFunctor&);
 };
 
-}  // namespace internal
-
 template <typename RAI, typename ComparisonFunction>
-void QuickSort(RAI first, RAI last, ComparisonFunction comparison,
-  const embb::mtapi::ExecutionPolicy& policy, size_t block_size) {
+void QuickSortIteratorCheck(RAI first, RAI last,
+  ComparisonFunction comparison,
+  const embb::mtapi::ExecutionPolicy& policy,
+  size_t block_size,
+  std::random_access_iterator_tag) {
   embb::mtapi::Node& node = embb::mtapi::Node::GetInstance();
   typedef typename std::iterator_traits<RAI>::difference_type difference_type;
   difference_type distance = std::distance(first, last);
-  if (distance <= 0) {
+  if (distance == 0) {
     return;
+  } else if (distance < 0) {
+    EMBB_THROW(embb::base::ErrorException, "Negative range for QuickSort");
   }
   unsigned int num_cores = policy.GetCoreCount();
   if (num_cores == 0) {
@@ -210,13 +213,23 @@ void QuickSort(RAI first, RAI last, ComparisonFunction comparison,
     EMBB_THROW(embb::base::ErrorException,
                "Not enough MTAPI tasks available for performing quick sort");
   }
-  internal::QuickSortFunctor<RAI, ComparisonFunction> functor(
+  QuickSortFunctor<RAI, ComparisonFunction> functor(
       first, last, comparison, policy, block_size);
   mtapi::Task task = node.Spawn(mtapi::Action(base::MakeFunction(
-      functor, &internal::QuickSortFunctor<RAI, ComparisonFunction>::Action)));
+      functor, &QuickSortFunctor<RAI, ComparisonFunction>::Action)));
   task.Wait(MTAPI_INFINITE);
 }
 
+}  // namespace internal
+
+template <typename RAI, typename ComparisonFunction>
+void QuickSort(RAI first, RAI last, ComparisonFunction comparison,
+  const embb::mtapi::ExecutionPolicy& policy, size_t block_size) {
+  typedef typename std::iterator_traits<RAI>::iterator_category category;
+  internal::QuickSortIteratorCheck(first, last, comparison,
+                                   policy, block_size, category());
+}
+
 }  // namespace algorithms
 }  // namespace embb
 
diff --git a/algorithms_cpp/include/embb/algorithms/internal/reduce-inl.h b/algorithms_cpp/include/embb/algorithms/internal/reduce-inl.h
index e8fb907..86892a2 100644
--- a/algorithms_cpp/include/embb/algorithms/internal/reduce-inl.h
+++ b/algorithms_cpp/include/embb/algorithms/internal/reduce-inl.h
@@ -129,7 +129,9 @@ ReturnType ReduceRecursive(RAI first, RAI last, ReturnType neutral,
   typedef typename std::iterator_traits<RAI>::difference_type difference_type;
   difference_type distance = std::distance(first, last);
   if (distance == 0) {
-    EMBB_THROW(embb::base::ErrorException, "Distance for Reduce is 0");
+    return neutral;
+  } else if (distance < 0) {
+    EMBB_THROW(embb::base::ErrorException, "Negative range for Reduce");
   }
   unsigned int num_cores = policy.GetCoreCount();
   if (num_cores == 0) {
diff --git a/algorithms_cpp/include/embb/algorithms/internal/scan-inl.h b/algorithms_cpp/include/embb/algorithms/internal/scan-inl.h
index ab2a21b..a3b6c99 100644
--- a/algorithms_cpp/include/embb/algorithms/internal/scan-inl.h
+++ b/algorithms_cpp/include/embb/algorithms/internal/scan-inl.h
@@ -173,14 +173,16 @@ void ScanIteratorCheck(RAIIn first, RAIIn last, RAIOut output_iterator,
                        std::random_access_iterator_tag) {
   typedef typename std::iterator_traits<RAIIn>::difference_type difference_type;
   difference_type distance = std::distance(first, last);
-  if (distance <= 0) {
+  if (distance == 0) {
     return;
+  } else if (distance < 0) {
+    EMBB_THROW(embb::base::ErrorException, "Negative range for Scan");
   }
   unsigned int num_cores = policy.GetCoreCount();
   if (num_cores == 0) {
     EMBB_THROW(embb::base::ErrorException, "No cores in execution policy");
   }
-  
+
   ReturnType values[MTAPI_NODE_MAX_TASKS_DEFAULT];
   if (block_size == 0) {
     block_size = static_cast<size_t>(distance) / num_cores;
diff --git a/algorithms_cpp/include/embb/algorithms/invoke.h b/algorithms_cpp/include/embb/algorithms/invoke.h
index b3ed429..1484d5a 100644
--- a/algorithms_cpp/include/embb/algorithms/invoke.h
+++ b/algorithms_cpp/include/embb/algorithms/invoke.h
@@ -58,7 +58,7 @@ typedef embb::base::Function<void> InvokeFunctionType;
 template<typename Function1, ...>
 void Invoke(
   Function1 func1,
-  /**< [in] First function to invoke */
+  /**< [in] First function object to invoke */
   ...);
 
 /**
@@ -72,7 +72,7 @@ void Invoke(
 template<typename Function1, ...>
 void Invoke(
   Function1 func1,
-  /**< [in] Function to invoke */
+  /**< [in] Function object to invoke */
   ...,
   const embb::mtapi::ExecutionPolicy & policy
   /**< [in] embb::mtapi::ExecutionPolicy to use */
diff --git a/algorithms_cpp/include/embb/algorithms/merge_sort.h b/algorithms_cpp/include/embb/algorithms/merge_sort.h
index 5b921f2..432f767 100644
--- a/algorithms_cpp/include/embb/algorithms/merge_sort.h
+++ b/algorithms_cpp/include/embb/algorithms/merge_sort.h
@@ -167,9 +167,20 @@ void MergeSortAllocate(
   typedef base::Allocation Alloc;
   typename std::iterator_traits<RAI>::difference_type distance = last - first;
   typedef typename std::iterator_traits<RAI>::value_type value_type;
+  if (distance == 0) {
+    return;
+  } else if (distance < 0) {
+    EMBB_THROW(embb::base::ErrorException, "Negative range for MergeSort");
+  }
   value_type* temporary = static_cast<value_type*>(
                             Alloc::Allocate(distance * sizeof(value_type)));
-  MergeSort(first, last, temporary, comparison, policy, block_size);
+  EMBB_TRY {
+    MergeSort(first, last, temporary, comparison, policy, block_size);
+  } EMBB_CATCH (embb::base::ErrorException & e) {
+    // embb exception handling does not support catch(...) and rethrow yet.
+    Alloc::Free(temporary);
+    EMBB_THROW(embb::base::ErrorException, e.what());
+  }
   Alloc::Free(temporary);
 }
 
diff --git a/algorithms_cpp/include/embb/algorithms/reduce.h b/algorithms_cpp/include/embb/algorithms/reduce.h
index 5cdb732..9058ee9 100644
--- a/algorithms_cpp/include/embb/algorithms/reduce.h
+++ b/algorithms_cpp/include/embb/algorithms/reduce.h
@@ -68,10 +68,10 @@ namespace algorithms {
  * \tparam RAI Random access iterator
  * \tparam ReturnType Type of result of reduction operation, deduced from
  *         \c neutral
- * \tparam ReductionFunction Binary reduction function with signature
+ * \tparam ReductionFunction Binary reduction function object with signature
  *         <tt>ReturnType ReductionFunction(ReturnType, ReturnType)</tt>.
- * \tparam TransformationFunction Unary transformation function with signature
- *         <tt>ReturnType TransformationFunction(typename
+ * \tparam TransformationFunction Unary transformation function object with
+ *         signature <tt>ReturnType TransformationFunction(typename
  *         std::iterator_traits<RAI>::value_type)</tt>
  */
 template<typename RAI, typename ReturnType, typename ReductionFunction,
diff --git a/algorithms_cpp/include/embb/algorithms/scan.h b/algorithms_cpp/include/embb/algorithms/scan.h
index 711e837..5d019cb 100644
--- a/algorithms_cpp/include/embb/algorithms/scan.h
+++ b/algorithms_cpp/include/embb/algorithms/scan.h
@@ -71,10 +71,10 @@ namespace algorithms {
  * \tparam RAIOut Random access iterator type of output range
  * \tparam ReturnType Type of output elements of scan operation, deduced from
  *         \c neutral
- * \tparam ScanFunction Binary scan function with signature
+ * \tparam ScanFunction Binary scan function object with signature
  *         <tt>ReturnType ScanFunction(ReturnType, ReturnType)</tt>
- * \tparam TransformationFunction Unary transformation function with signature
- *         <tt>ReturnType TransformationFunction(typename
+ * \tparam TransformationFunction Unary transformation function object with
+ *         signature <tt>ReturnType TransformationFunction(typename
  *         std::iterator_traits<RAIIn>::value_type)</tt>.
  */
 template<typename RAIIn, typename RAIOut, typename ReturnType,
diff --git a/algorithms_cpp/test/for_each_test.cc b/algorithms_cpp/test/for_each_test.cc
index 3ea68aa..3ca3081 100644
--- a/algorithms_cpp/test/for_each_test.cc
+++ b/algorithms_cpp/test/for_each_test.cc
@@ -205,12 +205,37 @@ void ForEachTest::TestPolicy() {
   for (size_t i = 0; i < count; i++) {
     PT_EXPECT_EQ(vector[i], init[i]*init[i]);
   }
-  
+
   vector = init;
   ForEach(vector.begin(), vector.end(), Square(), ExecutionPolicy(true, 1));
   for (size_t i = 0; i < count; i++) {
     PT_EXPECT_EQ(vector[i], init[i]*init[i]);
   }
+
+  // ForEach on empty list should not throw:
+  ForEach(vector.begin(), vector.begin(), Square());
+
+#ifdef EMBB_USE_EXCEPTIONS
+  bool empty_core_set_thrown = false;
+  try {
+    ForEach(vector.begin(), vector.end(), Square(), ExecutionPolicy(false));
+  }
+  catch (embb::base::ErrorException &) {
+    empty_core_set_thrown = true;
+  }
+  PT_EXPECT_MSG(empty_core_set_thrown,
+    "Empty core set should throw ErrorException");
+  bool negative_range_thrown = false;
+  try {
+    std::vector<int>::iterator second = vector.begin() + 1;
+    ForEach(second, vector.begin(), Square());
+  }
+  catch (embb::base::ErrorException &) {
+    negative_range_thrown = true;
+  }
+  PT_EXPECT_MSG(negative_range_thrown,
+    "Negative range should throw ErrorException");
+#endif
 }
 
 void ForEachTest::StressTest() {
diff --git a/algorithms_cpp/test/merge_sort_test.cc b/algorithms_cpp/test/merge_sort_test.cc
index cbcbf0b..d7b1170 100644
--- a/algorithms_cpp/test/merge_sort_test.cc
+++ b/algorithms_cpp/test/merge_sort_test.cc
@@ -156,28 +156,28 @@ void MergeSortTest::TestRanges() {
   }
 }
 
-//void MergeSortTest::TestBlockSizes() {
-//  using embb::algorithms::MergeSortAllocate;
-//  using embb::algorithms::ExecutionPolicy;
-//  size_t count = 4;
-//  std::vector<int> init(count);
-//  std::vector<int> vector(count);
-//  std::vector<int> vector_copy(count);
-//  for (size_t i = count - 1; i > 0; i--) {
-//    init[i] = static_cast<int>(i+2);
-//  }
-//  vector_copy = init;
-//  std::sort(vector_copy.begin(), vector_copy.end());
-//
-//  for (size_t block_size = 1; block_size < count + 2; block_size++) {
-//    vector = init;
-//    MergeSortAllocate(vector.begin(), vector.end(), std::less<int>(),
-//      ExecutionPolicy(), block_size);
-//    for (size_t i = 0; i < count; i++) {
-//      PT_EXPECT_EQ(vector[i], vector_copy[i]);
-//    }
-//  }
-//}
+void MergeSortTest::TestBlockSizes() {
+  using embb::algorithms::MergeSortAllocate;
+  using embb::mtapi::ExecutionPolicy;
+  size_t count = 4;
+  std::vector<int> init(count);
+  std::vector<int> vector(count);
+  std::vector<int> vector_copy(count);
+  for (size_t i = count - 1; i > 0; i--) {
+    init[i] = static_cast<int>(i+2);
+  }
+  vector_copy = init;
+  std::sort(vector_copy.begin(), vector_copy.end());
+
+  for (size_t block_size = 1; block_size < count + 2; block_size++) {
+    vector = init;
+    MergeSortAllocate(vector.begin(), vector.end(), std::less<int>(),
+      ExecutionPolicy(), block_size);
+    for (size_t i = 0; i < count; i++) {
+      PT_EXPECT_EQ(vector[i], vector_copy[i]);
+    }
+  }
+}
 
 void MergeSortTest::TestPolicy() {
   using embb::algorithms::MergeSortAllocate;
@@ -201,17 +201,43 @@ void MergeSortTest::TestPolicy() {
 
   vector = init;
   MergeSortAllocate(vector.begin(), vector.end(), std::less<int>(),
-            ExecutionPolicy(true));
+                    ExecutionPolicy(true));
   for (size_t i = 0; i < count; i++) {
      PT_EXPECT_EQ(vector_copy[i], vector[i]);
   }
 
   vector = init;
   MergeSortAllocate(vector.begin(), vector.end(), std::less<int>(),
-            ExecutionPolicy(true, 1));
+                    ExecutionPolicy(true, 1));
   for (size_t i = 0; i < count; i++) {
      PT_EXPECT_EQ(vector_copy[i], vector[i]);
   }
+
+  // MergeSort on empty list should not throw:
+  MergeSortAllocate(vector.begin(), vector.begin(), std::less<int>());
+
+#ifdef EMBB_USE_EXCEPTIONS
+  bool empty_core_set_thrown = false;
+  try {
+    MergeSortAllocate(vector.begin(), vector.end(), std::less<int>(),
+                      ExecutionPolicy(false));
+  }
+  catch (embb::base::ErrorException &) {
+    empty_core_set_thrown = true;
+  }
+  PT_EXPECT_MSG(empty_core_set_thrown,
+    "Empty core set should throw ErrorException");
+  bool negative_range_thrown = false;
+  try {
+    std::vector<int>::iterator second = vector.begin() + 1;
+    MergeSortAllocate(second, vector.begin(), std::less<int>());
+  }
+  catch (embb::base::ErrorException &) {
+    negative_range_thrown = true;
+  }
+  PT_EXPECT_MSG(negative_range_thrown,
+    "Negative range should throw ErrorException");
+#endif
 }
 
 void MergeSortTest::StressTest() {
diff --git a/algorithms_cpp/test/merge_sort_test.h b/algorithms_cpp/test/merge_sort_test.h
index 10545fb..7dbc8b0 100644
--- a/algorithms_cpp/test/merge_sort_test.h
+++ b/algorithms_cpp/test/merge_sort_test.h
@@ -58,7 +58,7 @@ class MergeSortTest : public partest::TestCase {
   /**
    * Tests various block sizes for the workers.
    */
-  //void TestBlockSizes();
+  void TestBlockSizes();
 
   /**
    * Tests setting policies (without checking their actual execution).
diff --git a/algorithms_cpp/test/quick_sort_test.cc b/algorithms_cpp/test/quick_sort_test.cc
index 8f724ca..863b278 100644
--- a/algorithms_cpp/test/quick_sort_test.cc
+++ b/algorithms_cpp/test/quick_sort_test.cc
@@ -218,6 +218,32 @@ void QuickSortTest::TestPolicy() {
   for (size_t i = 0; i < count; i++) {
      PT_EXPECT_EQ(vector_copy[i], vector[i]);
   }
+
+  // MergeSort on empty list should not throw:
+  QuickSort(vector.begin(), vector.begin(), std::less<int>());
+
+#ifdef EMBB_USE_EXCEPTIONS
+  bool empty_core_set_thrown = false;
+  try {
+    QuickSort(vector.begin(), vector.end(), std::less<int>(),
+      ExecutionPolicy(false));
+  }
+  catch (embb::base::ErrorException &) {
+    empty_core_set_thrown = true;
+  }
+  PT_EXPECT_MSG(empty_core_set_thrown,
+    "Empty core set should throw ErrorException");
+  bool negative_range_thrown = false;
+  try {
+    std::vector<int>::iterator second = vector.begin() + 1;
+    QuickSort(second, vector.begin(), std::less<int>());
+  }
+  catch (embb::base::ErrorException &) {
+    negative_range_thrown = true;
+  }
+  PT_EXPECT_MSG(negative_range_thrown,
+    "Negative range should throw ErrorException");
+#endif
 }
 
 void QuickSortTest::StressTest() {
diff --git a/algorithms_cpp/test/reduce_test.cc b/algorithms_cpp/test/reduce_test.cc
index 2ebebe5..c8ab5ae 100644
--- a/algorithms_cpp/test/reduce_test.cc
+++ b/algorithms_cpp/test/reduce_test.cc
@@ -181,6 +181,31 @@ void ReduceTest::TestPolicy() {
                Identity(), ExecutionPolicy(true)), sum);
   PT_EXPECT_EQ(Reduce(vector.begin(), vector.end(), 0, std::plus<int>(),
                Identity(), ExecutionPolicy(true, 1)), sum);
+  // Empty list should return neutral element:
+  PT_EXPECT_EQ(Reduce(vector.begin(), vector.begin(), 41, std::plus<int>(),
+               Identity(), ExecutionPolicy(true, 1)), 41);
+#ifdef EMBB_USE_EXCEPTIONS
+  bool empty_core_set_thrown = false;
+  try {
+    Reduce(vector.begin(), vector.end(), 0,
+           std::plus<int>(), Identity(),
+           ExecutionPolicy(false));
+  } catch (embb::base::ErrorException &) {
+    empty_core_set_thrown = true;
+  }
+  PT_EXPECT_MSG(empty_core_set_thrown,
+    "Empty core set should throw ErrorException");
+  bool negative_range_thrown = false;
+  try {
+    std::vector<int>::iterator second = vector.begin() + 1;
+    Reduce(second, vector.begin(), 0, std::plus<int>());
+  }
+  catch (embb::base::ErrorException &) {
+    negative_range_thrown = true;
+  }
+  PT_EXPECT_MSG(negative_range_thrown,
+    "Negative range should throw ErrorException");
+#endif
 }
 
 void ReduceTest::StressTest() {
diff --git a/algorithms_cpp/test/scan_test.cc b/algorithms_cpp/test/scan_test.cc
index e88effd..e902a81 100644
--- a/algorithms_cpp/test/scan_test.cc
+++ b/algorithms_cpp/test/scan_test.cc
@@ -290,6 +290,35 @@ void ScanTest::TestPolicy() {
     expected += vector[i];
     PT_EXPECT_EQ(expected, outputVector[i]);
   }
+  // Empty list should not throw and not change output:
+  outputVector = init;
+  std::vector<int>::iterator out_it = outputVector.begin();
+  Scan(vector.begin(), vector.begin(), out_it, 0, std::plus<int>());
+  PT_EXPECT(out_it == outputVector.begin());
+
+#ifdef EMBB_USE_EXCEPTIONS
+  bool empty_core_set_thrown = false;
+  try {
+    Scan(vector.begin(), vector.end(), outputVector.begin(),
+         0, std::plus<int>(), Identity(),
+         ExecutionPolicy(false));
+  }
+  catch (embb::base::ErrorException &) {
+    empty_core_set_thrown = true;
+  }
+  PT_EXPECT_MSG(empty_core_set_thrown,
+    "Empty core set should throw ErrorException");
+  bool negative_range_thrown = false;
+  try {
+    std::vector<int>::iterator second = vector.begin() + 1;
+    Scan(second, vector.begin(), outputVector.begin(), 0, std::plus<int>());
+  }
+  catch (embb::base::ErrorException &) {
+    negative_range_thrown = true;
+  }
+  PT_EXPECT_MSG(negative_range_thrown,
+    "Negative range should throw ErrorException");
+#endif
 }
 
 void ScanTest::StressTest() {
diff --git a/base_cpp/include/embb/base/internal/thread_closures.h b/base_cpp/include/embb/base/internal/thread_closures.h
index 214cb6e..03273ac 100644
--- a/base_cpp/include/embb/base/internal/thread_closures.h
+++ b/base_cpp/include/embb/base/internal/thread_closures.h
@@ -36,8 +36,8 @@ namespace internal {
 /**
  * Thread closure for thread start function with no arguments.
  *
- * Provides a thread start function calling a callable entity such as a function
- * pointer or functor.
+ * Provides a thread start function from which a priorly stored function object 
+ * is called.
  */
 template<typename Function>
 struct ThreadClosure {
@@ -56,8 +56,8 @@ struct ThreadClosure {
 /**
  * Thread closure for thread start function with one argument.
  *
- * Provides a thread start function calling a callable entity such as a function
- * pointer or functor.
+ * Provides a thread start function from which a priorly stored function object
+ * is called.
  */
 template<typename Function, typename Arg1>
 struct ThreadClosureArg1 {
@@ -78,8 +78,8 @@ struct ThreadClosureArg1 {
 /**
  * Thread closure for thread start function with two arguments.
  *
- * Provides a thread start function calling a callable entity such as a function
- * pointer or functor.
+ * Provides a thread start function from which a priorly stored function object
+ * is called.
  */
 template<typename Function, typename Arg1, typename Arg2>
 struct ThreadClosureArg2 {
diff --git a/base_cpp/include/embb/base/thread.h b/base_cpp/include/embb/base/thread.h
index 7691020..a2278ea 100644
--- a/base_cpp/include/embb/base/thread.h
+++ b/base_cpp/include/embb/base/thread.h
@@ -154,12 +154,12 @@ class Thread {
    * \memory A small constant amount of memory to store the function. This
    *         memory is freed the thread is joined.
    * \notthreadsafe
-   * \tparam Function Type of callable
+   * \tparam Function Function object type
    */
   template<typename Function>
   explicit Thread(
     Function function
-    /**< [IN] Callable (without arguments, must be copyable) */
+    /**< [IN] Copyable function object, callable without arguments */
     );
 
   /**
@@ -174,14 +174,14 @@ class Thread {
    * \memory A small constant amount of memory to store the function. This
    *         memory is freed the thread is joined.
    * \notthreadsafe
-   * \tparam Function Type of callable
+   * \tparam Function Function object type
    */
   template<typename Function>
   explicit Thread(
     CoreSet& core_set,
     /**< [IN] Set of cores on which the thread shall be executed. */
     Function function
-    /**< [IN] Callable (without arguments, must be copyable) */
+    /**< [IN] Copyable function object, callable without arguments */
     );
 
   /**
@@ -196,13 +196,13 @@ class Thread {
    * \memory A small constant amount of memory to store the function. This
    *         memory is freed the thread is joined.
    * \notthreadsafe
-   * \tparam Function Type of callable
+   * \tparam Function Function object type
    * \tparam Argument Type of argument
    */
   template<typename Function, typename Arg>
   Thread(
     Function function,
-    /**< [IN] Callable (with one argument, must be copyable) */
+    /**< [IN] Copyable function object, callable with one argument */
     Arg arg
     /**< [IN] Argument for function (must be copyable) */
     );
@@ -219,14 +219,14 @@ class Thread {
    * \memory A small constant amount of memory to store the function. This
    *         memory is freed the thread is joined.
    * \notthreadsafe
-   * \tparam Function Type of callable
+   * \tparam Function Function object type
    * \tparam Arg1 Type of first argument
    * \tparam Arg2 Type of second argument
    */
   template<typename Function, typename Arg1, typename Arg2>
   Thread(
     Function function,
-    /**< [IN] Callable (with two arguments, must be copyable) */
+    /**< [IN] Copyable function object, callable with two arguments */
     Arg1 arg1,
     /**< [IN] First argument for function (must be copyable) */
     Arg2 arg2
diff --git a/mtapi_c/include/embb/mtapi/c/mtapi.h b/mtapi_c/include/embb/mtapi/c/mtapi.h
index 51460cc..5347046 100644
--- a/mtapi_c/include/embb/mtapi/c/mtapi.h
+++ b/mtapi_c/include/embb/mtapi/c/mtapi.h
@@ -68,7 +68,7 @@
  *   </tr>
  *   <tr>
  *     <td>Action Function</td>
- *     <td>The callable, an executable function of an action, invoked by the
+ *     <td>The executable function of an action, invoked by the
  *         MTAPI runtime when a task is started.</td>
  *   </tr>
  *   <tr>
diff --git a/mtapi_cpp/include/embb/mtapi/action.h b/mtapi_cpp/include/embb/mtapi/action.h
index fc92f8f..68e9776 100644
--- a/mtapi_cpp/include/embb/mtapi/action.h
+++ b/mtapi_cpp/include/embb/mtapi/action.h
@@ -51,13 +51,13 @@ class Action {
   }
 
   /**
-    * Constructs an Action from any entity that provides an
-    * operator() (TaskContext &).
+    * Constructs an Action from a function object.
+    *
+    * \tparam Function Function object
     */
   template <typename Function>
   Action(
-    Function func                      /**< [in] Anything that provides an
-                                            operator() (TaskContext &). */
+    Function func                      /**< [in] Function object */
     )
     : function_(func)
     , execution_policy_() {
@@ -65,13 +65,13 @@ class Action {
   }
 
   /**
-    * Constructs an Action from any entity that provides an
-    * operator() (TaskContext &) and an Affinity.
+    * Constructs an Action from a function object and an Affinity.
+    *
+    * \tparam Function Function object
     */
   template <typename Function>
   Action(
-    Function func,                     /**< [in] Anything that provides an
-                                            operator() (TaskContext &). */
+    Function func,                     /**< [in] Function object */
     ExecutionPolicy execution_policy   /**< [in] Execution policy */
     )
     : function_(func)