diff --git a/THANKS.asciidoc b/THANKS.asciidoc
new file mode 100644
index 0000000..132b228
--- /dev/null
+++ b/THANKS.asciidoc
@@ -0,0 +1,7 @@
+The following people, in chronological order, have sent patches, pull
+requests, and/or bug reports that have been incorporated in CSCM's
+documentation base:
+
+1. Joseph Wayne Norton
+2. Klaus Trainer
+3. ...
diff --git a/src/contributors.asciidoc b/src/contributors.asciidoc
index 18bc4f4..21568ae 100644
--- a/src/contributors.asciidoc
+++ b/src/contributors.asciidoc
@@ -18,42 +18,226 @@ Joseph Wayne Norton <norton@alum.mit.edu>
 
 == Contributors
 
-*The current call for help is to implement the Scheme R7RS base
-library in Erlang.  A little bit of Scheme and/or Erlang programming
-experience is helpful but not absolutely necessary.*
+*The current call for help is to review, implement _(in Erlang)_, and
+test the Scheme R7RS base library.*
+
+- _v0.4.0_ Scheme base library (w/o numbers)
+ * section 6.1 https://github.com/the-concurrent-schemer/scm/blob/dev/src/scml_base_equality.erl[
+   Equivalence predicates]
+ * section 6.3 https://github.com/the-concurrent-schemer/scm/blob/dev/src/scml_base_boolean.erl[
+   Booleans]
+ * section 6.4 https://github.com/the-concurrent-schemer/scm/blob/dev/src/scml_base_list.erl[
+   Pairs and lists]
+ * section 6.5 https://github.com/the-concurrent-schemer/scm/blob/dev/src/scml_base_symbol.erl[
+   Symbols]
+ * section 6.6 https://github.com/the-concurrent-schemer/scm/blob/dev/src/scml_base_char.erl[
+   Characters]
+ * section 6.7 https://github.com/the-concurrent-schemer/scm/blob/dev/src/scml_base_string.erl[
+   Strings]
+ * section 6.8 https://github.com/the-concurrent-schemer/scm/blob/dev/src/scml_base_vector.erl[
+   Vectors]
+ * section 6.9 https://github.com/the-concurrent-schemer/scm/blob/dev/src/scml_base_bytevector.erl[
+   Bytevectors]
+ * section 6.10 https://github.com/the-concurrent-schemer/scm/blob/dev/src/scml_base_control.erl[
+   Control features]
+ * section 6.11 https://github.com/the-concurrent-schemer/scm/blob/dev/src/scml_base_exception.erl[
+   Exceptions]
+ * section 6.13 https://github.com/the-concurrent-schemer/scm/blob/dev/src/scml_base_io.erl[
+   Input and output]
+ * section 6.14 https://github.com/the-concurrent-schemer/scm/blob/dev/src/scml_base_system.erl[
+   System interface]
+
+A little bit of Scheme and/or Erlang programming experience is helpful
+but not absolutely necessary.
 
 CAUTION: _Please stay tuned for CSCM updates.  The specification,
 documentation, and software are under construction._
 
 == Getting Started
 
-An incomplete *todo* list of "Getting Started" steps.
+An incomplete list of steps for "Getting Started".
 
 *Mandatory*
 
-- read the Scheme overview brief
-- read the Scheme R7RS specification
-- download scm
-- build scm
-- run "hello world" example
-- review and understand
-  * the layout of the scm git repository
-  * the CSCM data model
-    ** mapping between Scheme and Erlang
-    ** Erlang "specs" and "types" used for documentation and dialyzer
-       purposes
-  * the Scheme tokenzier and parser
-  * the Scheme environment implementation
-  * the Scheme primitive expression implementation
-  * the Scheme derived expression implementation
-  * the Scheme continuations and exceptions implementation
-  * ...
-
-*Optional (but necessary)*
-
-- run xref
-- setup and run dialyzer
-- generate edocs
+1. read the Scheme
+  http://trac.sacrideo.us/wg/raw-attachment/wiki/WikiStart/overview.pdf[overview]
+  paper
+
+2. download and build
++
+[source,shell]
+------
+git clone git://github.com/the-concurrent-schemer/scm.git
+cd scm
+make deps
+make
+
+------
++
+TIP: Check the Software Requirements listed below before attempting to
+download and build!
+
+3. run "hello world" example
++
+[source,scheme]
+------
+(define hello-world
+  (lambda ()
+    (display "Hello World!")))
+------
++
+
+Since CSCM is under construction, this example must be run manually
+for the time being.  Let's use the Erlang shell for illustrative
+purposes.
+
+   a. Start the Erlang shell.
++
+[source,shell]
+------
+erl -pa ./deps/parse-tools/ebin -pa ebin
+------
+
+   b. Save the "hello word" program as an Erlang string.
++
+[source,erlang]
+------
+Str = "(define hello-world (lambda () (display \"Hello World!\")))".
+------
++
+
+   c. Create an empty Scheme environment.
++
+[source,erlang]
+------
+Env = scmi_env:the_empty().
+------
++
+
+   d. Create and register a native Erlang function as a simple
+      implementation for the Scheme display library procedure. The
+      Erlang function writes the given arguments to stdout as Erlang
+      terms and simply returns a Scheme #false to the caller.
++
+[source,erlang]
+------
+False = {boolean,undefined,false}.
+Proc = {nipv, 0, fun(Args) -> io:format("~p~n", [Args]), False end}.
+scmi_env:define_variable('display', Proc, Env).
+------
++
+
+   e. Parse and evaluate the "hello world" program.
++
+[source,erlang]
+------
+{ok, Exp} = scmd_parse:string(Str).
+scmi_eval:eval(Exp, Env).
+------
++
+
+   f. Call the Scheme "hello-world" procedure and show the Scheme
+      return value in the Erlang shell.
++
+[source,erlang]
+------
+R = scmi_eval:eval(['hello-world'], Env).
+R.
+------
+
+*Optional (but helpful)*
+
+1. read the Scheme R7RS
+   http://trac.sacrideo.us/wg/raw-attachment/wiki/WikiStart/r7rs-draft-9.pdf[draft9]
+   specification
+
+2. review and understand
+   a. the layout of the scm git
+      https://github.com/the-concurrent-schemer/scm/tree/dev[repository]
++
+TIP: Filename prefixes have meaning => +scmd_+ is "datum", +scmi_+ is
+"interpreter", +scmc_+ is "compiler", and +scml_+ is "library".
+
+   b. the CSCM datum model
+       ** https://github.com/the-concurrent-schemer/scm/blob/dev/src/scmd_types_impl.erl[implementation]
+          of Scheme datums by Erlang terms
+       ** Erlang
+          https://github.com/the-concurrent-schemer/scm/blob/dev/src/scmd_types.erl[types]
+          used for documentation and static type analysis
++
+TIP: If helpful, review Erlang's
+http://www.erlang.org/doc/reference_manual/typespec.html[documentation]
+about types and function specifications.
+
+   c. Scheme
+      https://github.com/the-concurrent-schemer/scm/blob/dev/src/scmd_scan.xrl[datum]
+      and number
+      (https://github.com/the-concurrent-schemer/scm/blob/dev/src/scmd_scan_num2.xrl[base
+      2],
+      https://github.com/the-concurrent-schemer/scm/blob/dev/src/scmd_scan_num8.xrl[base
+      8],
+      https://github.com/the-concurrent-schemer/scm/blob/dev/src/scmd_scan_num10.xrl[base
+      10], and
+      https://github.com/the-concurrent-schemer/scm/blob/dev/src/scmd_scan_num16.xrl[base
+      16]) tokenizers
+
+   d. Scheme
+      https://github.com/the-concurrent-schemer/scm/blob/dev/src/scmd_parse.yrl[datum]
+      and
+      https://github.com/the-concurrent-schemer/scm/blob/dev/src/scmd_parse_numR.yrl[number]
+      parsers
+
+   e. Scheme environment resource
+      https://github.com/the-concurrent-schemer/scm/blob/dev/src/scmi_env.erl[wrapper]
+      and
+      https://github.com/the-concurrent-schemer/scm/blob/dev/c_src/scmi_env.cc[NIF]
++
+TIP: If helpful, review Erlang's
+http://www.erlang.org/doc/man/erl_nif.html[documentation] about API
+functions for an Erlang NIF library.
+
+   f. Scheme interpreter
+      https://github.com/the-concurrent-schemer/scm/blob/dev/src/scmi_eval.erl[evaluator]
+      and
+      https://github.com/the-concurrent-schemer/scm/blob/dev/src/scmi_analyze.erl[syntactic
+      analyzer]
+
+   g. Scheme
+      https://github.com/the-concurrent-schemer/scm/blob/dev/src/scmi_analyze_primitive.erl[primitive]
+      expressions
+
+   h. Scheme
+      https://github.com/the-concurrent-schemer/scm/blob/dev/src/scmi_analyze_derived.erl[derived]
+      expressions
+
+   i. Scheme
+      https://github.com/the-concurrent-schemer/scm/blob/dev/src/scml_base_control.erl#L124[control
+      features] base library
+
+   j. Scheme
+      https://github.com/the-concurrent-schemer/scm/blob/dev/src/scml_base_exception.erl#L71[exceptions]
+      base library
+
+   k. ...
+
+3. run xref
++
+[source,shell]
+------
+make xref
+
+------
+
+4. generate edocs
++
+[source,shell]
+------
+make doc
+
+------
+
+NOTE: Steps describing how to setup and to run Erlang's dialyzer will
+be added later.
 
 == Submissions
 
diff --git a/src/index.asciidoc b/src/index.asciidoc
index f5c3e27..0ca0bc6 100644
--- a/src/index.asciidoc
+++ b/src/index.asciidoc
@@ -101,11 +101,10 @@ CSCM is aimed as an:
 
 This
 http://trac.sacrideo.us/wg/raw-attachment/wiki/WikiStart/overview.pdf[overview]
-of the Scheme programming language download-able from the Scheme
+paper of the Scheme programming language download-able from the Scheme
 Report\'s website is a good place to start.  The complete Scheme R7RS
-http://trac.sacrideo.us/wg/raw-attachment/wiki/WikiStart/r7rs-draft-9.pdf[draft
-9] specification available from the same website is the best next
-step.
+http://trac.sacrideo.us/wg/raw-attachment/wiki/WikiStart/r7rs-draft-9.pdf[draft9]
+specification available from the same website is the best next step.
 
 == Roadmap
 
@@ -371,9 +370,9 @@ Roadmap.
 (define #Fun (+ #Scheme #Erlang))
 
 If you are interested in Scheme, Erlang, Functional programming, or
-otherwise, please
-mailto:nortonATalum.mit.edu?subject=Inquiry%20about%20The%20Concurrent%20Schemer[contact
-Joe N.] for more information.
+otherwise, please check the
+http://the-concurrent-schemer.github.io/scm-doc/contributors.html[Contributor's
+Guide] for more information.
 
 == Copyright and License