diff --git a/README.md b/README.md
index 96d28ab..595183c 100755
--- a/README.md
+++ b/README.md
@@ -58,6 +58,8 @@ Glossary of Words
 -----------------
 
 * [Standard Core](./doc/standard.md)
+* [ANSI Terminal](./doc/ansiterm.md)
+* [Assertions & Testing](./doc/assert.md)
 * [Block File](./doc/block.md)
 * [Double-Cell](./doc/double.md)
 * [File Access](./doc/file.md)
diff --git a/doc/README.md b/doc/README.md
index 65dabf2..dcdd7af 100644
--- a/doc/README.md
+++ b/doc/README.md
@@ -8,6 +8,8 @@ Glossary of Words
 -----------------
 
 * [Standard Core](standard.md)
+* [ANSI Terminal](ansiterm.md)
+* [Assertions & Testing](assert.md)
 * [Block File](block.md)
 * [Double-Cell](double.md)
 * [File Access](file.md)
diff --git a/doc/ansiterm.md b/doc/ansiterm.md
new file mode 100644
index 0000000..d721aa1
--- /dev/null
+++ b/doc/ansiterm.md
@@ -0,0 +1,125 @@
+Post4 (Post-Forth)
+==================
+
+Copyright 2007, 2024 Anthony Howe.  All rights reserved.
+
+
+### ANSI Terminal Words
+
+Post4 assumes that the terminal is ANSI / VT-100 compatible.
+
+
+#### AT-XY
+( `col` `row` -- )  
+Position cursor on the terminal, `row` and `col` are zero (0) based.  This word is a standard word.
+
+- - -
+#### PAGE
+( -- )  
+Clear the terminal (advance next page).  This word is a standard word.
+
+- - -
+
+### Post4 Specific Words
+
+To use this extension word set:
+
+        include-path post4/ansiterm.p4
+
+
+####  ansi_normal
+( -- )  
+
+- - -
+####  ansi_bold
+( -- )  
+
+- - -
+####  ansi_dim
+( -- )  
+
+- - -
+####  ansi_standout
+( -- )  
+
+- - -
+####  ansi_underline
+( -- )  
+
+- - -
+####  ansi_blink
+( -- )  
+
+- - -
+####  ansi_reverse
+( -- )  
+
+- - -
+####  ansi_hide
+( -- )  
+
+- - -
+####  ansi_black
+( -- )  
+
+- - -
+####  ansi_red
+( -- )  
+
+- - -
+####  ansi_green
+( -- )  
+
+- - -
+####  ansi_yellow
+( -- )  
+
+- - -
+####  ansi_blue
+( -- )  
+
+- - -
+####  ansi_magenta
+( -- )  
+
+- - -
+####  ansi_cyan
+( -- )  
+
+- - -
+####  ansi_white
+( -- )  
+
+- - -
+####  ansi_bg_black
+( -- )  
+
+- - -
+####  ansi_bg_red
+( -- )  
+
+- - -
+####  ansi_bg_green
+( -- )  
+
+- - -
+####  ansi_bg_yellow
+( -- )  
+
+- - -
+####  ansi_bg_blue
+( -- )  
+
+- - -
+####  ansi_bg_magenta
+( -- )  
+
+- - -
+####  ansi_bg_cyan
+( -- )  
+
+- - -
+####  ansi_bg_white
+( -- )  
+
+- - -
diff --git a/doc/assert.md b/doc/assert.md
new file mode 100644
index 0000000..6db73e4
--- /dev/null
+++ b/doc/assert.md
@@ -0,0 +1,96 @@
+Post4 (Post-Forth)
+==================
+
+Copyright 2007, 2024 Anthony Howe.  All rights reserved.
+
+
+### Test Case Words
+
+To use this extension word set:
+
+        include-path post4/assert.p4
+
+A test case typically takes the form of
+
+        T{ <perform test> -> <expected stack results> }T
+
+For example:
+
+        T{ 1 2.71828 3 -> 1 2.71828 3 }T
+        T{ 1 2 + -> 3 }T
+
+- - -
+#### T{
+( -- )  
+Start a test case.
+
+- - -
+#### ->
+( -- )  
+Separate the test case results from the expected data and float stack.
+
+- - -
+#### }T
+( -- )  
+Compare the test results on the stacks against the expected data and float stacks, counting a pass, fail, or skipped result if the stacks fail to match.
+
+- - -
+
+### Post4 Specific Words
+
+An example of a test group:
+
+        .( INVERT ) test_group
+        t{ FALSE INVERT -> TRUE }t
+        t{ TRUE INVERT -> FALSE }t
+        t{ 0 INVERT -> -1 }t
+        test_group_end
+
+See the Post4 unit test suite (`test/units.p4`) based on the Forth Standard section F for examples.
+
+- - -
+#### assert
+( `bool` -- )  
+If `bool` is `TRUE` then count a pass result, otherwise count a failed result.
+
+- - -
+#### assert_not
+( `bool` -- )  
+If `bool` is `FALSE` then count a pass result, otherwise count a failed result.
+
+- - -
+#### assert_skip
+( `bool` -- )  
+If `bool` is `TRUE` then count a pass result, otherwise count a skipped result.
+
+- - -
+#### assert_not_skip
+( `bool` -- )  
+If `bool` is `FALSE` then count a pass result, otherwise count a skipped result.
+
+- - -
+#### test_group
+( -- )  
+Start a test group and set a marker `rm_test_group`.
+
+- - -
+#### test_group_end
+( -- )  
+End a test group and execute `rm_test_group` to clean-up the environment of test data and words.
+
+- - -
+#### test_suite
+( -- )  
+Start a test suite, which is a collection of test groups and test cases.  The stacks and counts are also cleared.
+
+- - -
+#### test_suite_end
+( -- )  
+End a test suite and report the results, stack size, passed, failed, and skipped.  If there were any failures, then Post4 exits with status code `1`; skipped results do not terminate Post4.
+
+- - -
+#### ts{
+( -- )  
+Start a test case and if the result is a failure, count it as skipped instead.  Test-skip is useful while developing a test case or if a test case is expected fail, but the test suite should continue.
+
+- - -