diff --git a/packages/compile/src/Helpers.js b/packages/compile/src/_shared/helpers.js
similarity index 100%
rename from packages/compile/src/Helpers.js
rename to packages/compile/src/_shared/helpers.js
index 21047d4e..1f1688ba 100644
--- a/packages/compile/src/Helpers.js
+++ b/packages/compile/src/_shared/helpers.js
@@ -1,9 +1,9 @@
 import util from 'util'
+import B from 'bufx'
+import parseCsv from 'csv-parse/lib/sync.js'
 import R from 'ramda'
 import split from 'split-string'
 import XLSX from 'xlsx'
-import parseCsv from 'csv-parse/lib/sync.js'
-import B from 'bufx'
 
 // Set true to print a stack trace in vlog
 export const PRINT_VLOG_TRACE = false
diff --git a/packages/compile/src/ReadDat.js b/packages/compile/src/_shared/read-dat.js
similarity index 97%
rename from packages/compile/src/ReadDat.js
rename to packages/compile/src/_shared/read-dat.js
index 7b3586f4..bccf04b6 100644
--- a/packages/compile/src/ReadDat.js
+++ b/packages/compile/src/_shared/read-dat.js
@@ -1,10 +1,9 @@
 import fs from 'fs'
-
 import B from 'bufx'
 import byline from 'byline'
 import R from 'ramda'
 
-import { canonicalVensimName } from './Helpers.js'
+import { canonicalVensimName } from './helpers.js'
 
 /**
  * Read a Vensim `dat` file with static data and return a Map.
diff --git a/packages/compile/src/Subscript.js b/packages/compile/src/_shared/subscript.js
similarity index 99%
rename from packages/compile/src/Subscript.js
rename to packages/compile/src/_shared/subscript.js
index 03ae4c7e..8a1f6c20 100644
--- a/packages/compile/src/Subscript.js
+++ b/packages/compile/src/_shared/subscript.js
@@ -1,8 +1,8 @@
 import util from 'util'
-import R from 'ramda'
 import B from 'bufx'
 import yaml from 'js-yaml'
-import { canonicalName, asort, vlog } from './Helpers.js'
+import R from 'ramda'
+import { canonicalName, asort, vlog } from './helpers.js'
 
 // A subscript is a dimension or an index.
 // Both have the same properties: model name, canonical name, family, values.
diff --git a/packages/compile/src/CodeGen.js b/packages/compile/src/generate/code-gen.js
similarity index 97%
rename from packages/compile/src/CodeGen.js
rename to packages/compile/src/generate/code-gen.js
index 15100251..b12e4edb 100644
--- a/packages/compile/src/CodeGen.js
+++ b/packages/compile/src/generate/code-gen.js
@@ -1,9 +1,11 @@
 import R from 'ramda'
-import ModelLHSReader from './ModelLHSReader.js'
-import EquationGen from './EquationGen.js'
-import Model from './Model.js'
-import { sub, allDimensions, allMappings, subscriptFamilies } from './Subscript.js'
-import { asort, lines, strlist, abend, mapIndexed } from './Helpers.js'
+
+import { asort, lines, strlist, abend, mapIndexed } from '../_shared/helpers.js'
+import { sub, allDimensions, allMappings, subscriptFamilies } from '../_shared/subscript.js'
+import Model from '../model/model.js'
+
+import EquationGen from './equation-gen.js'
+import ModelLHSReader from './model-lhs-reader.js'
 
 export function generateCode(parseTree, opts) {
   return codeGenerator(parseTree, opts).generate()
diff --git a/packages/compile/src/EquationGen.js b/packages/compile/src/generate/equation-gen.js
similarity index 99%
rename from packages/compile/src/EquationGen.js
rename to packages/compile/src/generate/equation-gen.js
index c715c29f..24c2afa7 100644
--- a/packages/compile/src/EquationGen.js
+++ b/packages/compile/src/generate/equation-gen.js
@@ -1,23 +1,8 @@
 import path from 'path'
+import { ModelLexer, ModelParser } from 'antlr4-vensim'
 import R from 'ramda'
 import XLSX from 'xlsx'
-import { ModelLexer, ModelParser } from 'antlr4-vensim'
-import ModelReader from './ModelReader.js'
-import ModelLHSReader from './ModelLHSReader.js'
-import LoopIndexVars from './LoopIndexVars.js'
-import Model from './Model.js'
-import {
-  dimensionNames,
-  extractMarkedDims,
-  hasMapping,
-  isDimension,
-  isIndex,
-  isTrivialDimension,
-  indexInSepDim,
-  normalizeSubscripts,
-  separatedVariableIndex,
-  sub
-} from './Subscript.js'
+
 import {
   canonicalName,
   cartesianProductOf,
@@ -34,7 +19,24 @@ import {
   readCsv,
   strToConst,
   vlog
-} from './Helpers.js'
+} from '../_shared/helpers.js'
+import {
+  dimensionNames,
+  extractMarkedDims,
+  hasMapping,
+  isDimension,
+  isIndex,
+  isTrivialDimension,
+  indexInSepDim,
+  normalizeSubscripts,
+  separatedVariableIndex,
+  sub
+} from '../_shared/subscript.js'
+import ModelReader from '../parse/model-reader.js'
+import Model from '../model/model.js'
+
+import LoopIndexVars from './loop-index-vars.js'
+import ModelLHSReader from './model-lhs-reader.js'
 
 export default class EquationGen extends ModelReader {
   constructor(variable, extData, directData, mode, modelDirname) {
diff --git a/packages/compile/src/LoopIndexVars.js b/packages/compile/src/generate/loop-index-vars.js
similarity index 92%
rename from packages/compile/src/LoopIndexVars.js
rename to packages/compile/src/generate/loop-index-vars.js
index a9c5fd17..df6c9373 100644
--- a/packages/compile/src/LoopIndexVars.js
+++ b/packages/compile/src/generate/loop-index-vars.js
@@ -1,4 +1,4 @@
-import { isDimension } from './Subscript.js'
+import { isDimension } from '../_shared/subscript.js'
 
 export default class LoopIndexVars {
   constructor(indexVars) {
diff --git a/packages/compile/src/ModelLHSReader.js b/packages/compile/src/generate/model-lhs-reader.js
similarity index 93%
rename from packages/compile/src/ModelLHSReader.js
rename to packages/compile/src/generate/model-lhs-reader.js
index 84e5cb1c..229c22f9 100644
--- a/packages/compile/src/ModelLHSReader.js
+++ b/packages/compile/src/generate/model-lhs-reader.js
@@ -1,8 +1,9 @@
 import R from 'ramda'
-import ModelReader from './ModelReader.js'
-import { createParser } from './Parser.js'
-import { sub, isDimension } from './Subscript.js'
-import { canonicalName } from './Helpers.js'
+
+import { canonicalName } from '../_shared/helpers.js'
+import { sub, isDimension } from '../_shared/subscript.js'
+import ModelReader from '../parse/model-reader.js'
+import { createParser } from '../parse/parser.js'
 
 //
 // ModelLHSReader parses the LHS of a var in Vensim format and
diff --git a/packages/compile/src/index.js b/packages/compile/src/index.js
index f4e8489a..14afd496 100644
--- a/packages/compile/src/index.js
+++ b/packages/compile/src/index.js
@@ -1,8 +1,8 @@
 // Copyright (c) 2022 Climate Interactive / New Venture Fund
 
-export { generateCode } from './CodeGen.js'
-export { parseAndGenerate, printNames } from './Entry.js'
-export { canonicalName } from './Helpers.js'
-export { parseModel } from './Parser.js'
-export { preprocessModel } from './Preprocessor.js'
-export { readDat } from './ReadDat.js'
+export { canonicalName } from './_shared/helpers.js'
+export { readDat } from './_shared/read-dat.js'
+export { preprocessModel } from './preprocess/preprocessor.js'
+export { parseModel } from './parse/parser.js'
+export { generateCode } from './generate/code-gen.js'
+export { parseAndGenerate, printNames } from './parse-and-generate.js'
diff --git a/packages/compile/src/EquationReader.js b/packages/compile/src/model/equation-reader.js
similarity index 99%
rename from packages/compile/src/EquationReader.js
rename to packages/compile/src/model/equation-reader.js
index f05c9b2f..2f20e002 100644
--- a/packages/compile/src/EquationReader.js
+++ b/packages/compile/src/model/equation-reader.js
@@ -1,18 +1,6 @@
 import { ModelParser } from 'antlr4-vensim'
 import R from 'ramda'
-import ExprReader from './ExprReader.js'
-import Model from './Model.js'
-import ModelReader from './ModelReader.js'
-import { createParser } from './Parser.js'
-import VariableReader from './VariableReader.js'
-import {
-  extractMarkedDims,
-  indexNamesForSubscript,
-  normalizeSubscripts,
-  separatedVariableIndex,
-  sub,
-  isDimension
-} from './Subscript.js'
+
 import {
   canonicalName,
   canonicalVensimName,
@@ -29,7 +17,21 @@ import {
   newLookupVarName,
   newFixedDelayVarName,
   cartesianProductOf
-} from './Helpers.js'
+} from '../_shared/helpers.js'
+import {
+  extractMarkedDims,
+  indexNamesForSubscript,
+  normalizeSubscripts,
+  separatedVariableIndex,
+  sub,
+  isDimension
+} from '../_shared/subscript.js'
+import ModelReader from '../parse/model-reader.js'
+import { createParser } from '../parse/parser.js'
+
+import ExprReader from './expr-reader.js'
+import Model from './model.js'
+import VariableReader from './variable-reader.js'
 
 // Set this true to get a list of functions used in the model. This may include lookups.
 const PRINT_FUNCTION_NAMES = false
diff --git a/packages/compile/src/ExprReader.js b/packages/compile/src/model/expr-reader.js
similarity index 97%
rename from packages/compile/src/ExprReader.js
rename to packages/compile/src/model/expr-reader.js
index 069ed492..ed08d47c 100644
--- a/packages/compile/src/ExprReader.js
+++ b/packages/compile/src/model/expr-reader.js
@@ -1,7 +1,9 @@
 import { ModelLexer, ModelVisitor } from 'antlr4-vensim'
-import { canonicalName } from './Helpers.js'
-import Model from './Model.js'
-import { createParser } from './Parser.js'
+
+import { canonicalName } from '../_shared/helpers.js'
+import { createParser } from '../parse/parser.js'
+
+import Model from './model.js'
 
 /**
  * Reads an expression and determines if it resolves to a constant numeric value.
diff --git a/packages/compile/src/Model.js b/packages/compile/src/model/model.js
similarity index 98%
rename from packages/compile/src/Model.js
rename to packages/compile/src/model/model.js
index 5ce495e3..3f067b40 100644
--- a/packages/compile/src/Model.js
+++ b/packages/compile/src/model/model.js
@@ -1,13 +1,8 @@
-import R from 'ramda'
 import B from 'bufx'
 import yaml from 'js-yaml'
-import toposort from './toposort.js'
-import VariableReader from './VariableReader.js'
-import VarNameReader from './VarNameReader.js'
-import SubscriptRangeReader from './SubscriptRangeReader.js'
-import EquationReader from './EquationReader.js'
-import Variable from './Variable.js'
-import { createParser } from './Parser.js'
+import R from 'ramda'
+
+import { decanonicalize, isIterable, listConcat, strlist, vlog, vsort } from '../_shared/helpers.js'
 import {
   addIndex,
   allAliases,
@@ -18,8 +13,15 @@ import {
   normalizeSubscripts,
   sub,
   subscriptFamilies
-} from './Subscript.js'
-import { decanonicalize, isIterable, listConcat, strlist, vlog, vsort } from './Helpers.js'
+} from '../_shared/subscript.js'
+import { createParser } from '../parse/parser.js'
+
+import EquationReader from './equation-reader.js'
+import SubscriptRangeReader from './subscript-range-reader.js'
+import toposort from './toposort.js'
+import VarNameReader from './var-name-reader.js'
+import Variable from './variable.js'
+import VariableReader from './variable-reader.js'
 
 let variables = []
 let inputVars = []
diff --git a/packages/compile/src/SubscriptRangeReader.js b/packages/compile/src/model/subscript-range-reader.js
similarity index 96%
rename from packages/compile/src/SubscriptRangeReader.js
rename to packages/compile/src/model/subscript-range-reader.js
index 2d3f030f..3ee42580 100644
--- a/packages/compile/src/SubscriptRangeReader.js
+++ b/packages/compile/src/model/subscript-range-reader.js
@@ -2,9 +2,10 @@ import path from 'path'
 import { ModelParser } from 'antlr4-vensim'
 import R from 'ramda'
 import XLSX from 'xlsx'
-import ModelReader from './ModelReader.js'
-import { Subscript } from './Subscript.js'
-import { cFunctionName, matchRegex, readCsv } from './Helpers.js'
+
+import { cFunctionName, matchRegex, readCsv } from '../_shared/helpers.js'
+import { Subscript } from '../_shared/subscript.js'
+import ModelReader from '../parse/model-reader.js'
 
 export default class SubscriptRangeReader extends ModelReader {
   constructor(modelDirname) {
diff --git a/packages/compile/src/toposort.js b/packages/compile/src/model/toposort.js
similarity index 100%
rename from packages/compile/src/toposort.js
rename to packages/compile/src/model/toposort.js
diff --git a/packages/compile/src/VarNameReader.js b/packages/compile/src/model/var-name-reader.js
similarity index 84%
rename from packages/compile/src/VarNameReader.js
rename to packages/compile/src/model/var-name-reader.js
index adb093de..cdb43ef0 100644
--- a/packages/compile/src/VarNameReader.js
+++ b/packages/compile/src/model/var-name-reader.js
@@ -1,8 +1,10 @@
-import ModelReader from './ModelReader.js'
 import R from 'ramda'
-import { createParser } from './Parser.js'
-import { sub, isIndex, normalizeSubscripts } from './Subscript.js'
-import { canonicalName } from './Helpers.js'
+
+import { canonicalName } from '../_shared/helpers.js'
+import { sub, isIndex, normalizeSubscripts } from '../_shared/subscript.js'
+import ModelReader from '../parse/model-reader.js'
+import { createParser } from '../parse/parser.js'
+
 //
 // VarNameReader reads a model var name using the parser to get the var name in C format.
 // This is used to generate a variable output in the output section.
diff --git a/packages/compile/src/VariableReader.js b/packages/compile/src/model/variable-reader.js
similarity index 95%
rename from packages/compile/src/VariableReader.js
rename to packages/compile/src/model/variable-reader.js
index 5fd86f1f..c34cff04 100644
--- a/packages/compile/src/VariableReader.js
+++ b/packages/compile/src/model/variable-reader.js
@@ -1,10 +1,19 @@
 import { ModelParser } from 'antlr4-vensim'
 import R from 'ramda'
-import ModelReader from './ModelReader.js'
-import Model from './Model.js'
-import Variable from './Variable.js'
-import { sub, isDimension, isIndex, normalizeSubscripts, subscriptsMatch, isSubdimension } from './Subscript.js'
-import { canonicalName, vlog, strlist, cartesianProductOf } from './Helpers.js'
+
+import { canonicalName, vlog, strlist, cartesianProductOf } from '../_shared/helpers.js'
+import {
+  sub,
+  isDimension,
+  isIndex,
+  normalizeSubscripts,
+  subscriptsMatch,
+  isSubdimension
+} from '../_shared/subscript.js'
+import ModelReader from '../parse/model-reader.js'
+
+import Model from './model.js'
+import Variable from './variable.js'
 
 // Set true to print extra debugging information to stderr.
 const DEBUG_LOG = false
diff --git a/packages/compile/src/Variable.js b/packages/compile/src/model/variable.js
similarity index 100%
rename from packages/compile/src/Variable.js
rename to packages/compile/src/model/variable.js
diff --git a/packages/compile/src/Entry.js b/packages/compile/src/parse-and-generate.js
similarity index 92%
rename from packages/compile/src/Entry.js
rename to packages/compile/src/parse-and-generate.js
index 97785e38..3b220318 100644
--- a/packages/compile/src/Entry.js
+++ b/packages/compile/src/parse-and-generate.js
@@ -3,12 +3,12 @@
 import path from 'path'
 import B from 'bufx'
 
-import { generateCode } from './CodeGen.js'
-import { readXlsx } from './Helpers.js'
-import Model from './Model.js'
-import { parseModel } from './Parser.js'
-import { readDat } from './ReadDat.js'
-import { printSubscripts, yamlSubsList } from './Subscript.js'
+import { readXlsx } from './_shared/helpers.js'
+import { readDat } from './_shared/read-dat.js'
+import { printSubscripts, yamlSubsList } from './_shared/subscript.js'
+import { parseModel } from './parse/parser.js'
+import Model from './model/model.js'
+import { generateCode } from './generate/code-gen.js'
 
 /**
  * Parse a Vensim model and generate C code.
diff --git a/packages/compile/src/ModelReader.js b/packages/compile/src/parse/model-reader.js
similarity index 100%
rename from packages/compile/src/ModelReader.js
rename to packages/compile/src/parse/model-reader.js
diff --git a/packages/compile/src/Parser.js b/packages/compile/src/parse/parser.js
similarity index 100%
rename from packages/compile/src/Parser.js
rename to packages/compile/src/parse/parser.js
diff --git a/packages/compile/src/Preprocessor.js b/packages/compile/src/preprocess/preprocessor.js
similarity index 98%
rename from packages/compile/src/Preprocessor.js
rename to packages/compile/src/preprocess/preprocessor.js
index 839cb8de..64c720ea 100644
--- a/packages/compile/src/Preprocessor.js
+++ b/packages/compile/src/preprocess/preprocessor.js
@@ -1,7 +1,7 @@
 import path from 'path'
-import R from 'ramda'
 import B from 'bufx'
-import { splitEquations, replaceDelimitedStrings } from './Helpers.js'
+import R from 'ramda'
+import { splitEquations, replaceDelimitedStrings } from '../_shared/helpers.js'
 
 export let preprocessModel = (mdlFilename, spec, profile = 'genc', writeFiles = false, outDecls = []) => {
   const MACROS_FILENAME = 'macros.txt'