diff --git a/surveys/exact-expt.md b/surveys/exact-expt.md
index 3807ade..1af4539 100644
--- a/surveys/exact-expt.md
+++ b/surveys/exact-expt.md
@@ -1,9 +1,79 @@
 # Exact expt
 
-This tests whether exponentiation of exact numbers produces an exact result.  The test expression was `(expt 1/3 3)`, except on systems without inexact rationals, where `(expt 3 3)` was substituted.
+## Exact rational base
 
-Exact exponentiation supported:  Racket, Gauche, MIT, Gambit, Chicken with the `numbers` egg, Bigloo, Scheme48/scsh, Guile, Kawa, SISC, Chez, Vicare, Larceny, Ypsilon, Mosh, IronScheme, STklos, KSi, TinyScheme, Scheme 9, RScheme, S7, XLisp, Rep, UBM, Sizzle, Oaklisp, Sagittarius, Picrin, Owl Lisp, Chibi, Loko
+This tests whether exponentiation of exact numbers produces an exact result.
+The test expression was `(expt 1/3 3)`, except on systems without exact rationals, where `(expt 3 3)` was substituted.
 
-Only inexact exponentiation supported:  plain Chicken, SCM, NexJ, JScheme, Unlikely, Elk, SXM, Dfsch, Inlab
 
-No support or broken support for `expt`:  SigScheme, Shoe, Mini-Scheme, SIOD, Schemik, Llava, FemtoLisp, LMU
+| System      | `(expt 1/3 3)`        | `(expt 3 3)` |
+|-------------|-----------------------|--------------|
+| Bigloo      |                       | 27           |
+| Biwa        |                       | 27           |
+| Chez        | 1/27                  |              |
+| Chibi       | 1/27                  |              |
+| Chicken     | 1/27                  |              |
+| Elk         |                       | 27           |
+| Gambit      | 1/27                  |              |
+| Gauche      | 1/27                  |              |
+| Guile       | 1/27                  |              |
+| Kawa        | 1/27                  |              |
+| LIPS        | 1/27                  |              |
+| Loko        | 1/27                  |              |
+| MIT         | 1/27                  |              |
+| Racket      | 1/27                  |              |
+| Sagittarius | 1/27                  |              |
+| Scheme48    | 1/27                  |              |
+| Scheme9     |                       | 27           |
+| SCM         | 3.7037037037037035e-2 |              |
+| STklos      | 1/27                  |              |
+| Tinyscheme  |                       | 27           |
+
+
+## Exact rational exponent
+
+What happens when the exponent is an exact rational, the base is exact, and it *would* be possible to return an exact result?
+
+The following expression was evaluated:
+
+```
+(expt 81 1/4)
+```
+
+Implementations that do not support rationals are not included.
+Some Common Lisp systems were also checked, for comparison.
+
+| system      | `(expt 81 1/4)`    |
+|-------------|--------------------|
+| Chez        | 3.0                |
+| Chibi       | 3.0                |
+| Chicken     | 3                  |
+| Gambit      | 3                  |
+| Gauche      | 3                  |
+| Guile       | 3.0                |
+| Kawa        | 3.0                |
+| LIPS        | 3                  |
+| Loko        | 3.000000238418579  |
+| MIT         | 3.0                |
+| Racket      | 3.0                |
+| Sagittarius | 3.0                |
+| Scheme48    | 3.0000000000000004 |
+| SCM         | 3.0                |
+| STklos      | 3.0000000000000004 |
+|-------------|--------------------|
+| ABCL        | 3.0                |
+| CCL         | 3.0                |
+| Clisp       | 3                  |
+| ECL         | 3.0                |
+| GCL         | 3.0000000000000006 |
+| SBCL        | 3.0                |
+
+* The systems with result `3.0` in the first column are those where `(= 3.0 (expt 81 1/4))` is true.
+  In the other systems, which do not return the precise `3.0` floating-point representation, the
+  returned value indicates at least one digit where it differs from 3.0.
+
+* The test  `(= 3.0 (expt 81 1/4))` was necessary, since we do not know if `3.0` actually means a
+  precise representation of the number. For example, STklos will answer `3.0`, but after changing
+  the default print precision with `(real-precision 50)`, it will show that the number is not
+  the same as `3.0`.
+