diff --git a/src/data/id.rs b/src/data/id.rs
index 160dfea..145e060 100644
--- a/src/data/id.rs
+++ b/src/data/id.rs
@@ -1,4 +1,7 @@
-use crate::data::record::{Field, FieldRecord};
+use crate::{
+    data::record::Field,
+    error::{ErrorType, MTTError},
+};
 use std::fmt;
 use uuid::Uuid;
 
@@ -8,20 +11,33 @@ pub struct ID {
 }
 
 impl ID {
-    pub fn new() -> Self {
+    pub fn new(data: Uuid) -> Self {
+        Self { data: data }
+    }
+
+    pub fn random() -> Self {
         Self {
             data: Uuid::new_v4(),
         }
     }
 }
 
-impl FieldRecord for ID {
-    fn new_field() -> Field {
-        Field::ID(ID::new())
-    }
+impl TryFrom<Uuid> for ID {
+    type Error = MTTError;
 
-    fn get_type() -> String {
-        "id".to_string()
+    fn try_from(value: Uuid) -> Result<Self, Self::Error> {
+        Ok(Self::new(value))
+    }
+}
+
+impl TryFrom<&str> for ID {
+    type Error = MTTError;
+
+    fn try_from(value: &str) -> Result<Self, Self::Error> {
+        match Uuid::try_from(value) {
+            Ok(id) => Ok(ID::new(id)),
+            Err(_) => Err(MTTError::new(ErrorType::FieldIDInvalid(value.to_string()))),
+        }
     }
 }
 
@@ -31,42 +47,52 @@ impl fmt::Display for ID {
     }
 }
 
-#[cfg(test)]
-mod fielddata {
-    use super::*;
-
-    #[test]
-    fn new_ids_are_unique() {
-        let mut ids: Vec<String> = Vec::new();
-        for _ in 1..10 {
-            match ID::new_field() {
-                Field::ID(id) => {
-                    let id_string = id.to_string();
-                    assert!(!ids.contains(&id_string), "'{}' repeated", id_string);
-                    ids.push(id_string);
-                }
-            }
-        }
-    }
-
-    #[test]
-    fn get_type() {
-        assert_eq!(ID::get_type(), "id");
-    }
-}
-
 #[cfg(test)]
 mod id {
     use super::*;
 
     #[test]
-    fn id_are_unique() {
+    fn try_from_uuid() {
+        let data = Uuid::new_v4();
+        let id = ID::try_from(data.clone()).unwrap();
+        assert_eq!(id.to_string(), data.to_string());
+    }
+
+    #[test]
+    fn try_from_str() {
+        let holder = Uuid::new_v4().to_string();
+        let data = holder.as_str();
+        let id = ID::try_from(data).unwrap();
+        assert_eq!(id.to_string(), data);
+    }
+
+    #[test]
+    fn try_from_bad_str() {
+        let bad = "BadUuid";
+        match ID::try_from(bad) {
+            Ok(_) => unreachable!("Should have failed to create an ID"),
+            Err(err) => match err.get_code() {
+                ErrorType::FieldIDInvalid(id) => assert_eq!(id, bad),
+                _ => unreachable!("Returned wrong error"),
+            },
+        }
+    }
+
+    #[test]
+    fn create_new() {
+        let data = Uuid::new_v4();
+        let id = ID::new(data.clone());
+        assert_eq!(id.to_string(), data.to_string());
+    }
+
+    #[test]
+    fn random_is_unique() {
         let mut ids: Vec<String> = Vec::new();
-        for _ in 1..10 {
-            let id = ID::new();
-            let id_string = id.to_string();
-            assert!(!ids.contains(&id_string), "'{}' repeated", id_string);
-            ids.push(id_string);
+        for _ in 0..10 {
+            let id = ID::random();
+            let holder = id.to_string();
+            assert!(!ids.contains(&holder), "'{}' is a duplicate entry", id);
+            ids.push(holder);
         }
     }
 }
diff --git a/src/data/mod.rs b/src/data/mod.rs
index fd654d7..d2b1b4f 100644
--- a/src/data/mod.rs
+++ b/src/data/mod.rs
@@ -1,15 +1,29 @@
 mod id;
 mod record;
 
-use crate::data::record::Record;
+use crate::{
+    data::{
+        id::ID,
+        record::{Field, Record},
+    },
+    error::{ErrorType, MTTError},
+};
 use std::collections::HashMap;
 
+enum FieldType {
+    ID,
+}
+
 struct FieldDef;
 
 impl FieldDef {
     fn new() -> Self {
         Self {}
     }
+
+    fn get_type(&self) -> FieldType {
+        FieldType::ID
+    }
 }
 
 struct Table {
@@ -23,19 +37,35 @@ impl Table {
         }
     }
 
-    fn len(&self) -> usize {
-        self.fields.len()
+    fn description(&self) -> &HashMap<String, FieldDef> {
+        &self.fields
     }
 
-    fn add_field(&mut self, name: &str, field_type: &str) -> Result<(), String> {
+    fn add_field(&mut self, name: &str, field_type: FieldType) -> Result<(), MTTError> {
         match self.fields.get(name) {
-            Some(_) => Err("duplicate field name".to_string()),
+            Some(_) => {
+                let err = ErrorType::TableAddFieldDuplicate(name.to_string());
+                Err(MTTError::new(err))
+            }
             None => {
                 self.fields.insert(name.to_string(), FieldDef::new());
                 Ok(())
             }
         }
     }
+
+    fn add_record(&mut self, rec: Record) -> Result<Record, MTTError> {
+        for (key, _) in rec.iter() {
+            match self.fields.get(key) {
+                Some(_) => {}
+                None => {
+                    let err = ErrorType::TableRecordInvalidFieldName(key.to_string());
+                    return Err(MTTError::new(err));
+                }
+            }
+        }
+        Ok(rec)
+    }
 }
 
 #[cfg(test)]
@@ -45,23 +75,72 @@ mod table {
     #[test]
     fn new_table() {
         let tbl = Table::new();
-        assert_eq!(tbl.len(), 0);
+        let data = tbl.description();
+        assert_eq!(data.len(), 0);
     }
 
     #[test]
     fn add_field() {
         let mut tbl = Table::new();
-        tbl.add_field("one", "id");
-        assert_eq!(tbl.len(), 1);
+        let field_name = "something ";
+        tbl.add_field(field_name, FieldType::ID);
+        let data = tbl.description();
+        assert_eq!(data.len(), 1);
+        match data.get(field_name) {
+            Some(field_info) => match field_info.get_type() {
+                FieldType::ID => {}
+                _ => unreachable!("incorrect field type"),
+            },
+            None => unreachable!("should return field definition"),
+        }
     }
 
     #[test]
     fn error_on_duplicate_name() {
         let mut tbl = Table::new();
-        tbl.add_field("one", "id");
-        match tbl.add_field("one", "id") {
+        let name = "one";
+        tbl.add_field(name, FieldType::ID);
+        match tbl.add_field(name, FieldType::ID) {
             Ok(_) => unreachable!(" Should not duplicates."),
-            Err(_) => {}
+            Err(err) => match err.get_code() {
+                ErrorType::TableAddFieldDuplicate(result) => assert_eq!(result, name),
+                _ => unreachable!("should produce a duplicate name error"),
+            },
+        }
+    }
+
+    #[test]
+    fn add_record() {
+        let mut tbl = Table::new();
+        let name = "id";
+        let field_data = ID::random();
+        tbl.add_field(name, FieldType::ID).unwrap();
+        let mut data: HashMap<String, Field> = HashMap::new();
+        data.insert(name.to_string(), field_data.clone().into());
+        let rec = Record::new(data);
+        let result = tbl.add_record(rec).unwrap();
+        assert_eq!(
+            result.get(name).unwrap().to_string(),
+            field_data.to_string()
+        );
+    }
+
+    #[test]
+    fn add_record_incorrect_field_name() {
+        let mut tbl = Table::new();
+        let name = "id";
+        let field_data = ID::random();
+        let mut data: HashMap<String, Field> = HashMap::new();
+        data.insert(name.to_string(), field_data.clone().into());
+        let rec = Record::new(data);
+        match tbl.add_record(rec) {
+            Ok(_) => unreachable!("should have produced an error"),
+            Err(err) => match err.get_code() {
+                ErrorType::TableRecordInvalidFieldName(result) => {
+                    assert_eq!(result, name);
+                }
+                _ => unreachable!("should have been invalid name error"),
+            },
         }
     }
 }
diff --git a/src/data/record.rs b/src/data/record.rs
index d1d2de0..62da269 100644
--- a/src/data/record.rs
+++ b/src/data/record.rs
@@ -1,40 +1,14 @@
 use crate::data::id::ID;
-use std::{collections::HashMap, fmt};
+use std::{collections::HashMap, fmt, ops::Deref};
 
 #[derive(Clone)]
 pub enum Field {
     ID(ID),
 }
 
-impl Field {
-    fn new(field_type: &str) -> Field {
-        ID::new_field()
-    }
-}
-
-pub trait FieldRecord {
-    fn new_field() -> Field;
-    fn get_type() -> String;
-}
-
-pub struct Record {
-    data: HashMap<String, Field>,
-}
-
-impl Record {
-    fn new(data: HashMap<String, Field>) -> Self {
-        Self { data: data }
-    }
-
-    fn len(&self) -> usize {
-        self.data.len()
-    }
-
-    fn get(&self, name: &str) -> Field {
-        match self.data.get(name) {
-            Some(data) => data.clone(),
-            None => unreachable!(),
-        }
+impl From<ID> for Field {
+    fn from(value: ID) -> Self {
+        Field::ID(value)
     }
 }
 
@@ -46,16 +20,33 @@ impl fmt::Display for Field {
     }
 }
 
+pub struct Record {
+    data: HashMap<String, Field>,
+}
+
+impl Record {
+    pub fn new(data: HashMap<String, Field>) -> Self {
+        Self { data: data }
+    }
+}
+
+impl Deref for Record {
+    type Target = HashMap<String, Field>;
+
+    fn deref(&self) -> &Self::Target {
+        &self.data
+    }
+}
+
 #[cfg(test)]
 mod fields {
     use super::*;
 
     #[test]
-    fn creaAte_new_id() {
-        match Field::new("id") {
-            Field::ID(_) => {}
-            _ => unreachable!("Fould should be an ID type."),
-        }
+    fn from_id() {
+        let id = ID::random();
+        let field = Field::from(id.clone());
+        assert_eq!(field.to_string(), id.to_string());
     }
 }
 
@@ -71,18 +62,17 @@ mod records {
     }
 
     #[test]
-    fn new_record_more_data() {
-        let a = ID::new_field();
-        let b = ID::new_field();
-        let c = ID::new_field();
+    fn record_iter() {
+        let a = Field::from(ID::random());
+        let b = Field::from(ID::random());
+        let c = Field::from(ID::random());
         let mut data: HashMap<String, Field> = HashMap::new();
         data.insert("a".to_string(), a.clone());
         data.insert("b".to_string(), b.clone());
         data.insert("c".to_string(), c.clone());
-        let rec = Record::new(data);
-        assert_eq!(rec.len(), 3);
-        assert_eq!(rec.get("a").to_string(), a.to_string(), "record a");
-        assert_eq!(rec.get("b").to_string(), b.to_string(), "record b");
-        assert_eq!(rec.get("c").to_string(), c.to_string(), "record c");
+        let rec = Record::new(data.clone());
+        for (key, value) in rec.iter() {
+            assert_eq!(value.to_string(), data.get(key).unwrap().to_string());
+        }
     }
 }
diff --git a/src/error.rs b/src/error.rs
index 5114bc1..9347691 100644
--- a/src/error.rs
+++ b/src/error.rs
@@ -1,28 +1,42 @@
 use std::{error::Error, fmt};
 
 #[derive(Debug)]
-enum ErrorType {
+pub enum ErrorType {
+    FieldIDInvalid(String),
     TableAddFieldDuplicate(String),
+    TableRecordInvalidFieldName(String),
 }
 
 impl fmt::Display for ErrorType {
     fn fmt(&self, f: &mut fmt::Formatter<'_>) -> fmt::Result {
         match self {
+            ErrorType::FieldIDInvalid(data) => write!(f, "'{}' is not a valid uuid", data),
             ErrorType::TableAddFieldDuplicate(data) => write!(f, "field '{}' already exists", data),
+            ErrorType::TableRecordInvalidFieldName(data) => {
+                write!(f, "invalid field name '{}'", data)
+            }
         }
     }
 }
 
 #[derive(Debug)]
-struct MTTError {
+pub struct MTTError {
     err: ErrorType,
 }
 
+impl From<ErrorType> for MTTError {
+    fn from(value: ErrorType) -> Self {
+        MTTError::new(value)
+    }
+}
+
 impl MTTError {
-    fn new(err: ErrorType) -> Self {
-        Self { 
-            err: err,
-        }
+    pub fn new(err: ErrorType) -> Self {
+        Self { err: err }
+    }
+
+    pub fn get_code(&self) -> &ErrorType {
+        &self.err
     }
 }
 
@@ -37,15 +51,50 @@ impl fmt::Display for MTTError {
 #[cfg(test)]
 mod errors {
     use super::*;
+    use rand::{distributions::Alphanumeric, Rng};
+
+    fn rand_str() -> String {
+        rand::thread_rng()
+            .sample_iter(&Alphanumeric)
+            .take(5)
+            .map(char::from)
+            .collect()
+    }
 
     #[test]
-    fn get_error() {
-        let err = MTTError::new(ErrorType::TableAddFieldDuplicate("tester".to_string()));
-        assert_eq!(err.to_string(), "field 'tester' already exists");
-        assert!(err.source().is_none());
-        let err = MTTError::new(ErrorType::TableAddFieldDuplicate("other".to_string()));
-        assert_eq!(err.to_string(), "field 'other' already exists");
-        assert!(err.source().is_none());
+    fn from_invalid_id() {
+        let data = rand_str();
+        let etype = ErrorType::FieldIDInvalid(data.clone());
+        let result = MTTError::from(etype);
+        match result.get_code() {
+            ErrorType::FieldIDInvalid(txt) => assert_eq!(txt, &data),
+            _ => unreachable!("should have been ErrorType::FieldIDInvalid"),
+        }
+        assert_eq!(
+            result.to_string(),
+            format!("'{}' is not a valid uuid", data)
+        );
+    }
+
+    #[test]
+    fn from_duplicate_table_name() {
+        let data = rand_str();
+        let etype = ErrorType::TableAddFieldDuplicate(data.clone());
+        let result = MTTError::from(etype);
+        match result.get_code() {
+            ErrorType::TableAddFieldDuplicate(txt) => assert_eq!(txt, &data),
+            _ => unreachable!("should have been ErrorType::FieldIDInvalid"),
+        }
+        assert_eq!(
+            result.to_string(),
+            format!("field '{}' already exists", data)
+        );
+    }
+
+    #[test]
+    fn error_type_strings() {
+        let data = rand_str();
+        let etype = ErrorType::TableRecordInvalidFieldName(data.clone());
+        assert_eq!(etype.to_string(), format!("invalid field name '{}'", data));
     }
 }
-