diff --git a/src/EAFunds/EAFunds_Model.bs.js b/src/EAFunds/EAFunds_Model.bs.js
index 44b7f3ce..248540e2 100644
--- a/src/EAFunds/EAFunds_Model.bs.js
+++ b/src/EAFunds/EAFunds_Model.bs.js
@@ -1,6 +1,10 @@
 'use strict';
 
+var Block = require("bs-platform/lib/js/block.js");
+var Curry = require("bs-platform/lib/js/curry.js");
+var CamlinternalOO = require("bs-platform/lib/js/camlinternalOO.js");
 var Math$ProbExample = require("../Math.bs.js");
+var Model$ProbExample = require("../Model.bs.js");
 
 function yearDiff(year) {
   return year - 2020.0;
@@ -70,9 +74,102 @@ function run(group, year, output) {
             ]);
 }
 
-var Model = { };
+var model_002 = /* assumptions : :: */[
+  Model$ProbExample.Input.make("Yearly Growth Rate", /* FloatPoint */0, undefined, /* () */0),
+  /* :: */[
+    Model$ProbExample.Input.currentYear,
+    /* [] */0
+  ]
+];
+
+var model_003 = /* inputs : :: */[
+  Model$ProbExample.Input.make("Fund", /* SingleChoice */Block.__(1, [/* record */[
+            /* options : :: */[
+              /* tuple */[
+                "Animal Welfare Fund",
+                "animal"
+              ],
+              /* :: */[
+                /* tuple */[
+                  "Global Health Fund",
+                  "globalHealth"
+                ],
+                /* :: */[
+                  /* tuple */[
+                    "Long Term Future Fund",
+                    "longTerm"
+                  ],
+                  /* :: */[
+                    /* tuple */[
+                      "Meta Fund",
+                      "metaFund"
+                    ],
+                    /* :: */[
+                      /* tuple */[
+                        "Total",
+                        "total"
+                      ],
+                      /* [] */0
+                    ]
+                  ]
+                ]
+              ]
+            ],
+            /* default */"total"
+          ]]), undefined, /* () */0),
+  /* :: */[
+    Model$ProbExample.Input.make("Year", /* Year */Block.__(0, [/* record */[
+              /* default */2030.0,
+              /* min */2020.0,
+              /* max */2050.0
+            ]]), undefined, /* () */0),
+    /* [] */0
+  ]
+];
+
+var model_004 = /* outputs : :: */[
+  Model$ProbExample.Output.make("Payments", /* FloatCdf */2, undefined, /* () */0),
+  /* :: */[
+    Model$ProbExample.Output.make("Payouts", /* FloatCdf */2, undefined, /* () */0),
+    /* [] */0
+  ]
+];
+
+var model = /* record */[
+  /* name */"Calculate the payments and payouts of EA Funds based on existing data.",
+  /* author */"George Harrison",
+  model_002,
+  model_003,
+  model_004
+];
+
+var class_tables = [
+  0,
+  0,
+  0
+];
+
+function run$1(a, i) {
+  if (!class_tables[0]) {
+    var $$class = CamlinternalOO.create_table(0);
+    var env = CamlinternalOO.new_variable($$class, "");
+    var env_init = function (env$1) {
+      var self = CamlinternalOO.create_object_opt(0, $$class);
+      self[env] = env$1;
+      return self;
+    };
+    CamlinternalOO.init_class($$class);
+    class_tables[0] = env_init;
+  }
+  return Curry._1(class_tables[0], 0);
+}
+
+var Interface = {
+  model: model,
+  run: run$1
+};
 
 exports.PayoutsIfAround = PayoutsIfAround;
 exports.run = run;
-exports.Model = Model;
-/* No side effect */
+exports.Interface = Interface;
+/* model Not a pure module */
diff --git a/src/EAFunds/EAFunds_Model.re b/src/EAFunds/EAFunds_Model.re
index 2d61897d..9ee92a4f 100644
--- a/src/EAFunds/EAFunds_Model.re
+++ b/src/EAFunds/EAFunds_Model.re
@@ -52,10 +52,47 @@ let run = (group: group, year: float, output: output) => {
   );
 };
 
-module Model = {
-  type params = {
-    groups: array(fundWithInfo),
-    year: float,
-    outputs: array(output),
+module Interface = {
+  open Model;
+  let model = {
+    name: "Calculate the payments and payouts of EA Funds based on existing data.",
+    author: "George Harrison",
+    assumptions: [
+      Input.make(~name="Yearly Growth Rate", ~parameterType=FloatPoint, ()),
+      Input.currentYear,
+    ],
+    inputs: [
+      Input.make(
+        ~name="Fund",
+        ~parameterType=
+          SingleChoice({
+            default: Some("total"),
+            options: [
+              ("Animal Welfare Fund", "animal"),
+              ("Global Health Fund", "globalHealth"),
+              ("Long Term Future Fund", "longTerm"),
+              ("Meta Fund", "metaFund"),
+              ("Total", "total"),
+            ],
+          }),
+        (),
+      ),
+      Input.make(
+        ~name="Year",
+        ~parameterType=
+          Year({
+            default: Some(2030.0),
+            min: Some(2020.0),
+            max: Some(2050.0),
+          }),
+        (),
+      ),
+    ],
+    outputs: [
+      Output.make(~name="Payments", ~parameterType=FloatCdf, ()),
+      Output.make(~name="Payouts", ~parameterType=FloatCdf, ()),
+    ],
   };
+
+  let run = (a, i) => {};
 };
\ No newline at end of file
diff --git a/src/Model.re b/src/Model.re
index ae3f8434..5c8e78ed 100644
--- a/src/Model.re
+++ b/src/Model.re
@@ -1,22 +1,40 @@
 module IOTypes = {
-  type singleChoice = {options: list(string)};
+  type singleChoice = {
+    options: list((string, string)),
+    default: option(string),
+  };
   type floatPoint = {validatations: list(float => bool)};
-  type withDefault('a) = {default: option('a)};
+  type withDefaultMinMax('a) = {
+    default: option('a),
+    min: option('a),
+    max: option('a),
+  };
 };
 
 module Input = {
   type parameterType =
-    | Year(IOTypes.withDefault(float))
+    | Year(IOTypes.withDefaultMinMax(float))
     | SingleChoice(IOTypes.singleChoice)
     | FloatPoint
     | FloatCdf;
 
   type parameter = {
+    id: string,
     name: string,
     parameterType,
   };
 
-  let make = (name, parameterType) => {name, parameterType};
+  let currentYear = {
+    id: "currentyear",
+    name: "Current Year",
+    parameterType: FloatPoint,
+  };
+
+  let make = (~name, ~parameterType, ~id=name, ()) => {
+    id,
+    name,
+    parameterType,
+  };
 };
 
 module Output = {
@@ -27,42 +45,22 @@ module Output = {
     | FloatCdf;
 
   type parameter = {
+    id: string,
     name: string,
     parameterType,
   };
 
-  let make = (name, parameterType) => {name, parameterType};
+  let make = (~name, ~parameterType, ~id=name, ()) => {
+    id,
+    name,
+    parameterType,
+  };
 };
 
-type props = {
+type model = {
   name: string,
   author: string,
   assumptions: list(Input.parameter),
   inputs: list(Input.parameter),
   outputs: list(Output.parameter),
-};
-
-let model1 = {
-  name: "Calculate the payments and payouts of EA Funds based on existing data.",
-  author: "George Harrison",
-  assumptions: [Input.make("Yearly Growth Rate", FloatPoint)],
-  inputs: [
-    Input.make(
-      "Fund",
-      SingleChoice({
-        options: [
-          "Animal Welfare Fund",
-          "Global Health Fund",
-          "Long Term Future Fund",
-          "Meta Fund",
-          "Total",
-        ],
-      }),
-    ),
-    {name: "Year", parameterType: Year({default: Some(2030.0)})},
-  ],
-  outputs: [
-    Output.make("Payments", FloatCdf),
-    Output.make("Payouts", FloatCdf),
-  ],
 };
\ No newline at end of file