diff --git a/PyroFetes/Models/Availability.cs b/PyroFetes/Models/Availability.cs
index a727c3a..5d85e0d 100644
--- a/PyroFetes/Models/Availability.cs
+++ b/PyroFetes/Models/Availability.cs
@@ -5,8 +5,8 @@ namespace PyroFetes.Models;
 public class Availability
 {
     [Key]    public int Id { get; set; }
-    [Required] public string AvailabilityDate { get; set; }
-    [Required] public string DeliveryDate { get; set; }
-    [Required] public string ExpirationDate { get; set; }
-    [Required] public string RenewallDate { get; set; }
+    [Required] public string? AvailabilityDate { get; set; }
+    [Required] public DateOnly DeliveryDate { get; set; }
+    [Required] public DateOnly ExpirationDate { get; set; }
+    [Required] public DateOnly RenewallDate { get; set; }
 }
\ No newline at end of file
diff --git a/PyroFetes/Models/Communication.cs b/PyroFetes/Models/Communication.cs
index 7c3e284..6faa91a 100644
--- a/PyroFetes/Models/Communication.cs
+++ b/PyroFetes/Models/Communication.cs
@@ -5,9 +5,9 @@ namespace PyroFetes.Models;
 public class Communication
 {
     [Key]   public int Id { get; set; }
-    [Required] public string Calling { get; set; }
-    [Required] public string Email { get; set; }
-    [Required] public string Meeting { get; set; }
+    [Required] public string? Calling { get; set; }
+    [Required] public string? Email { get; set; }
+    [Required] public string? Meeting { get; set; }
     
     //REL
 }
\ No newline at end of file
diff --git a/PyroFetes/Models/Contact.cs b/PyroFetes/Models/Contact.cs
index 87385bc..8b6a6cf 100644
--- a/PyroFetes/Models/Contact.cs
+++ b/PyroFetes/Models/Contact.cs
@@ -5,14 +5,16 @@ namespace PyroFetes.Models;
 public class Contact
 {
     [Key] public int Id { get; set; }
-    [Required] public string LastName { get; set; }
-    [Required] public string FirstName { get; set; }
-    [Required] public string Email { get; set; }
-    [Required] public string PhoneNumber { get; set; }
-    [Required] public string Address { get; set; }
-    [Required] public string Role { get; set; }
+    [Required, MaxLength(100)] public string? LastName { get; set; }
+    [Required, MaxLength(100)] public string? FirstName { get; set; }
+    [Required] public string? Email { get; set; }
+    [Required] public string? PhoneNumber { get; set; }
+    [Required] public string? Address { get; set; }
+    [Required] public string? ZipCode { get; set; }
+    [Required] public string? City { get; set; }
+    [Required] public string? Role { get; set; }
     
     //RELATIONS DE CON LA
-    public int CommunicationID { get; set; }
+    public int CommunicationId { get; set; }
     public Communication? Communication { get; set; }
 }
\ No newline at end of file
diff --git a/PyroFetes/Models/Customer.cs b/PyroFetes/Models/Customer.cs
index 3e7139a..31f0203 100644
--- a/PyroFetes/Models/Customer.cs
+++ b/PyroFetes/Models/Customer.cs
@@ -6,6 +6,7 @@ public class Customer
 {
     [Key] public int Id { get; set; }
     [Required] public string? Note { get; set; }
+    
     //Les relations
     public int CustomerTypeId { get; set; }
     public CustomerType? CustomerType { get; set; }
diff --git a/PyroFetes/Models/CustomerType.cs b/PyroFetes/Models/CustomerType.cs
index 28fc14d..3e24483 100644
--- a/PyroFetes/Models/CustomerType.cs
+++ b/PyroFetes/Models/CustomerType.cs
@@ -5,7 +5,7 @@ namespace PyroFetes.Models;
 public class CustomerType
 {
     [Key]  public int Id { get; set; }
-    [Required] public string? Price { get; set; }
-    //RELATIONS PTN
+    [Required] public decimal Price { get; set; }
+    
     public List<Customer>? Customers { get; set; }
 }
\ No newline at end of file
diff --git a/PyroFetes/Models/ExperienceLevel.cs b/PyroFetes/Models/ExperienceLevel.cs
index 8a2bb93..41a1879 100644
--- a/PyroFetes/Models/ExperienceLevel.cs
+++ b/PyroFetes/Models/ExperienceLevel.cs
@@ -5,5 +5,5 @@ namespace PyroFetes.Models;
 public class ExperienceLevel
 {
     [Key]    public int Id { get; set; }
-    [Required] public string Label { get; set; }
+    [Required] public string? Label { get; set; }
 }
\ No newline at end of file
diff --git a/PyroFetes/Models/HistoryOfApproval.cs b/PyroFetes/Models/HistoryOfApproval.cs
index 4e05886..8c85ef8 100644
--- a/PyroFetes/Models/HistoryOfApproval.cs
+++ b/PyroFetes/Models/HistoryOfApproval.cs
@@ -5,6 +5,6 @@ namespace PyroFetes.Models;
 public class HistoryOfApproval
 {
     [Key]    public int Id { get; set; }
-    [Required] public string ExpirationDate { get; set; }
-    [Required] public string DeliveryDate { get; set; }
+    [Required] public DateOnly ExpirationDate { get; set; }
+    [Required] public DateOnly DeliveryDate { get; set; }
 }
\ No newline at end of file
diff --git a/PyroFetes/Models/Provider.cs b/PyroFetes/Models/Provider.cs
index fdfc566..f48e2c3 100644
--- a/PyroFetes/Models/Provider.cs
+++ b/PyroFetes/Models/Provider.cs
@@ -9,6 +9,6 @@ public class Provider
     
     //Relations
     
-    public int ProviderID { get; set; }
+    public int ProviderId { get; set; }
     public ProviderType? ProviderType { get; set; }
 }
\ No newline at end of file
diff --git a/PyroFetes/Models/ProviderType.cs b/PyroFetes/Models/ProviderType.cs
index ac620c9..4c8f70c 100644
--- a/PyroFetes/Models/ProviderType.cs
+++ b/PyroFetes/Models/ProviderType.cs
@@ -5,5 +5,5 @@ namespace PyroFetes.Models;
 public class ProviderType
 {
     [Key]   public int Id { get; set; }
-    [Required] public string Label { get; set; }
+    [Required] public string? Label { get; set; }
 }
\ No newline at end of file
diff --git a/PyroFetes/Models/Staff.cs b/PyroFetes/Models/Staff.cs
index fef94d9..c405e21 100644
--- a/PyroFetes/Models/Staff.cs
+++ b/PyroFetes/Models/Staff.cs
@@ -1,10 +1,10 @@
-using System.ComponentModel.DataAnnotations;
+using System.ComponentModel.DataAnnotations;
 
 namespace PyroFetes.Models;
 
 public class Staff
 {
     [Key]   public int Id { get; set; }
-    [Required] public string F4T2NumberApproval { get; set; }
-    [Required] public string F4T2ExpirationDate { get; set; }
+    [Required] public string? F4T2NumberApproval { get; set; }
+    [Required] public string? F4T2ExpirationDate { get; set; }
 }
\ No newline at end of file