1diff --git a/src/Parser/Parser.ts b/src/Parser/Parser.ts
  2index 7002e00..f97abd3 100644
  3--- a/src/Parser/Parser.ts
  4+++ b/src/Parser/Parser.ts
  5@@ -354,16 +354,16 @@ let Parser = (function () {
  6           action = ACTION_TABLE[state] && ACTION_TABLE[state][symbol];
  7         }
  8 
  9-        console.log({
 10-          text: lexer.match,
 11-          token: SYMBOL_INDEX_TO_NAME[symbol] || symbol,
 12-          tokenIndex: symbol,
 13-          line: lexer.yylineno,
 14-          loc: yyloc,
 15-          state: state,
 16-          stack: stack,
 17-          semanticValueStack: semanticValueStack
 18-        });
 19+        // console.log({
 20+        //   text: lexer.match,
 21+        //   token: SYMBOL_INDEX_TO_NAME[symbol] || symbol,
 22+        //   tokenIndex: symbol,
 23+        //   line: lexer.yylineno,
 24+        //   loc: yyloc,
 25+        //   state: state,
 26+        //   stack: stack,
 27+        //   semanticValueStack: semanticValueStack
 28+        // });
 29 
 30         // handle parse error
 31         if (typeof action === 'undefined' || !action.length || !action[0]) {
 32diff --git a/src/Parser/ParserConstants.ts b/src/Parser/ParserConstants.ts
 33index 87e3e28..1145f3b 100644
 34--- a/src/Parser/ParserConstants.ts
 35+++ b/src/Parser/ParserConstants.ts
 36@@ -6,7 +6,7 @@ import {
 37 const WHITE_SPACE_RULE = /^(?:\s+)/;
 38 const DOUBLE_QUOTES_RULE = /^(?:"(\\["]|[^"])*")/;
 39 const SINGLE_QUOTES_RULE = /^(?:'(\\[']|[^'])*')/;
 40-const FORMULA_NAME_RULE = /^(?:[A-Za-z.]{1,}[A-Za-z_0-9]+(?=[(]))/; // Changed from /^(?:[A-Za-z]{1,}[A-Za-z_0-9]+(?=[(]))/
 41+const FORMULA_NAME_RULE = /^(?:[A-Za-z.]{1,}[A-Za-z_0-9]+(?=[(]))/;
 42 const $_A1_CELL_RULE = /^(?:\$[A-Za-z]+\$[0-9]+)/;
 43 const A1_CELL_RULE = /^(?:[A-Za-z]+[0-9]+)/;
 44 const FORMULA_NAME_SIMPLE_RULE = /^(?:[A-Za-z.]+(?=[(]))/;
 45@@ -366,6 +366,7 @@ const enum State {
 46   NUMBER_FOLLOWED_BY_CARROT = 29,
 47   ADD_TWO_NUMBERS = 45,
 48   LESS_THAN_EQUALS = 46,
 49+  GREATER_THAN_EQUALS = 49,
 50   SUBTRACT_TWO_NUMBERS = 52,
 51   MULTIPLY_TWO_NUMBERS = 53,
 52   DIVIDE_TWO_NUMBERS = 54,
 53@@ -704,7 +705,7 @@ table[State.GREATER_THAN] = ObjectBuilder
 54   .add(Symbol.VARIABLE_SEQUENCE, 3)
 55   .add(Symbol.NUMBER, State.START_NUMBER)
 56   .add(Symbol.STRING, [SHIFT, State.START_STRING])
 57-  .add(Symbol.EQUALS, [SHIFT, 49])
 58+  .add(Symbol.EQUALS, [SHIFT, State.GREATER_THAN_EQUALS])
 59   .add(Symbol.PLUS, [SHIFT, 10])
 60   .add(Symbol.LEFT_PAREN, [SHIFT, State.LEFT_PAREN])
 61   .add(Symbol.MINUS, [SHIFT, 9])
 62@@ -1010,7 +1011,7 @@ table[48] = ObjectBuilder
 63   .add(Symbol.SEMI_COLON, [REDUCE, ReduceActions.LT])
 64   .add(Symbol.COMMA, [REDUCE, ReduceActions.LT])
 65   .build();
 66-table[49] = ObjectBuilder
 67+table[State.GREATER_THAN_EQUALS] = ObjectBuilder
 68   .add(Symbol.ERROR, 13)
 69   .add(Symbol.EXPRESSION, State.COMPARE_TWO_EXPRESSIONS_WITH_GTE)
 70   .add(Symbol.VARIABLE_SEQUENCE, 3)
 71diff --git a/tests/Parser/ParseEngineTest.ts b/tests/Parser/ParseEngineTest.ts
 72index d9246d2..8382045 100644
 73--- a/tests/Parser/ParseEngineTest.ts
 74+++ b/tests/Parser/ParseEngineTest.ts
 75@@ -370,13 +370,15 @@ test("Parse ^ operator", function(){
 76   assertEquals(parser.parse('2 ^ 10'), 1024);
 77 });
 78 
 79-test("Parse equality operators", function(){
 80+test("Parse comparison operators on numbers", function(){
 81   assertEquals(parser.parse('1 = 1'), true);
 82   assertEquals(parser.parse('1 = 0'), false);
 83   assertEquals(parser.parse('1 < 2'), true);
 84   assertEquals(parser.parse('1 < 0'), false);
 85+  assertEquals(parser.parse('1 < 1'), false);
 86+  assertEquals(parser.parse('1 <= 0'), false);
 87   assertEquals(parser.parse('1 <= 1'), true);
 88-  assertEquals(parser.parse('1 <= 2'), true);// fails...
 89+  assertEquals(parser.parse('1 <= 2'), true);
 90   assertEquals(parser.parse('1 >= 1'), true);
 91   assertEquals(parser.parse('2 >= 1'), true);
 92   assertEquals(parser.parse('1 >= 0'), true);
 93@@ -385,6 +387,40 @@ test("Parse equality operators", function(){
 94   assertEquals(parser.parse('1 <> 2'), true);
 95 });
 96 
 97+test("Parse comparison operators on strings", function(){
 98+  assertEquals(parser.parse('"abc" = "abc"'), true);
 99+  assertEquals(parser.parse('"abc" = "xyz"'), false);
100+  assertEquals(parser.parse('"abc" < "abc"'), false);
101+  assertEquals(parser.parse('"abc" < "xyz"'), true);
102+  assertEquals(parser.parse('"abc" <= "abc"'), true);
103+  assertEquals(parser.parse('"abc" <= "xyz"'), true);
104+  assertEquals(parser.parse('"xyz" <= "abc"'), false);
105+  assertEquals(parser.parse('"abc" >= "abc"'), true);
106+  assertEquals(parser.parse('"abc" >= "zyx"'), false);
107+  assertEquals(parser.parse('"xyz" >= "abc"'), true);
108+  assertEquals(parser.parse('"abc" <> "abc"'), false);
109+  assertEquals(parser.parse('"abc" <> "zyz"'), true);
110+});
111+
112+test("Parse comparison operators on boolean", function(){
113+  assertEquals(parser.parse('TRUE = TRUE'), true);
114+  assertEquals(parser.parse('TRUE = FALSE'), false);
115+  assertEquals(parser.parse('FALSE = FALSE'), true);
116+  assertEquals(parser.parse('TRUE > TRUE'), false);
117+  assertEquals(parser.parse('TRUE > FALSE'), true);
118+  assertEquals(parser.parse('FALSE > FALSE'), false);
119+  assertEquals(parser.parse('TRUE <= TRUE'), true);
120+  assertEquals(parser.parse('TRUE <= FALSE'), false);
121+  assertEquals(parser.parse('FALSE <= TRUE'), true);
122+  assertEquals(parser.parse('TRUE >= TRUE'), true);
123+  assertEquals(parser.parse('TRUE >= FALSE'), true);
124+  assertEquals(parser.parse('FALSE >= TRUE'), false);
125+  assertEquals(parser.parse('TRUE <> TRUE'), false);
126+  assertEquals(parser.parse('FALSE <> FALSE'), false);
127+  assertEquals(parser.parse('TRUE <> FALSE'), true);
128+  assertEquals(parser.parse('FALSE <> TRUE'), true);
129+});
130+
131 test("Parse operators, order of operations", function(){
132   assertEquals(parser.parse('10 + -10'), 0);
133   assertEquals(parser.parse('10 + -10 = 0'), true);
134@@ -521,4 +557,4 @@ test("Parse range following comma", function(){
135 
136 
137 
138-assertEquals(parser.parse('1 <= 2'), true);
139+assertEquals(parser.parse('"one" = "one"'), true);