diff --git a/src/shared/dto/composant.dto.ts b/src/shared/dto/composant.dto.ts
new file mode 100644
index 0000000..f638d6d
--- /dev/null
+++ b/src/shared/dto/composant.dto.ts
@@ -0,0 +1,63 @@
+import { IsString, IsOptional, IsNumber } from 'class-validator';
+import { Transform } from 'class-transformer';
+
+export class CreateComposantDto {
+  @IsString()
+  name: string;
+
+  @IsOptional()
+  @IsString()
+  machineId?: string;
+
+  @IsOptional()
+  @IsString()
+  parentComposantId?: string;
+
+  @IsOptional()
+  @IsString()
+  reference?: string;
+
+  @IsOptional()
+  @IsString()
+  prestataire?: string;
+
+  @IsOptional()
+  @Transform(({ value }) => value === '' ? null : value)
+  @IsNumber({}, { message: 'prix must be a valid number' })
+  prix?: number | null;
+
+  @IsOptional()
+  @IsString()
+  emplacement?: string;
+
+  @IsOptional()
+  @IsString()
+  typeComposantId?: string;
+}
+
+export class UpdateComposantDto {
+  @IsOptional()
+  @IsString()
+  name?: string;
+
+  @IsOptional()
+  @IsString()
+  reference?: string;
+
+  @IsOptional()
+  @IsString()
+  prestataire?: string;
+
+  @IsOptional()
+  @Transform(({ value }) => value === '' ? null : value)
+  @IsNumber({}, { message: 'prix must be a valid number' })
+  prix?: number | null;
+
+  @IsOptional()
+  @IsString()
+  emplacement?: string;
+
+  @IsOptional()
+  @IsString()
+  typeComposantId?: string;
+} 
\ No newline at end of file
diff --git a/src/shared/dto/custom-field.dto.ts b/src/shared/dto/custom-field.dto.ts
new file mode 100644
index 0000000..6d0f536
--- /dev/null
+++ b/src/shared/dto/custom-field.dto.ts
@@ -0,0 +1,29 @@
+import { IsString, IsOptional, IsNotEmpty } from 'class-validator';
+
+export class CreateCustomFieldValueDto {
+  @IsString()
+  @IsNotEmpty()
+  customFieldId: string;
+
+  @IsString()
+  @IsNotEmpty()
+  value: string;
+
+  @IsOptional()
+  @IsString()
+  machineId?: string;
+
+  @IsOptional()
+  @IsString()
+  composantId?: string;
+
+  @IsOptional()
+  @IsString()
+  pieceId?: string;
+}
+
+export class UpdateCustomFieldValueDto {
+  @IsOptional()
+  @IsString()
+  value?: string;
+} 
\ No newline at end of file
diff --git a/src/shared/dto/document.dto.ts b/src/shared/dto/document.dto.ts
new file mode 100644
index 0000000..864f83c
--- /dev/null
+++ b/src/shared/dto/document.dto.ts
@@ -0,0 +1,52 @@
+import { IsString, IsOptional, IsNumber } from 'class-validator';
+
+export class CreateDocumentDto {
+  @IsString()
+  name: string;
+
+  @IsString()
+  filename: string;
+
+  @IsString()
+  path: string;
+
+  @IsString()
+  mimeType: string;
+
+  @IsNumber()
+  size: number;
+
+  @IsOptional()
+  @IsString()
+  machineId?: string;
+
+  @IsOptional()
+  @IsString()
+  composantId?: string;
+
+  @IsOptional()
+  @IsString()
+  pieceId?: string;
+}
+
+export class UpdateDocumentDto {
+  @IsOptional()
+  @IsString()
+  name?: string;
+
+  @IsOptional()
+  @IsString()
+  filename?: string;
+
+  @IsOptional()
+  @IsString()
+  path?: string;
+
+  @IsOptional()
+  @IsString()
+  mimeType?: string;
+
+  @IsOptional()
+  @IsNumber()
+  size?: number;
+} 
\ No newline at end of file
diff --git a/src/shared/dto/machine.dto.ts b/src/shared/dto/machine.dto.ts
new file mode 100644
index 0000000..bb1cf47
--- /dev/null
+++ b/src/shared/dto/machine.dto.ts
@@ -0,0 +1,55 @@
+import { IsString, IsOptional, IsNumber, IsDecimal } from 'class-validator';
+
+export class CreateMachineDto {
+  @IsString()
+  name: string;
+
+  @IsString()
+  siteId: string;
+
+  @IsOptional()
+  @IsString()
+  reference?: string;
+
+  @IsOptional()
+  @IsString()
+  prestataire?: string;
+
+  @IsOptional()
+  @IsDecimal()
+  prix?: string;
+
+  @IsOptional()
+  @IsString()
+  emplacement?: string;
+
+  @IsOptional()
+  @IsString()
+  typeMachineId?: string;
+}
+
+export class UpdateMachineDto {
+  @IsOptional()
+  @IsString()
+  name?: string;
+
+  @IsOptional()
+  @IsString()
+  reference?: string;
+
+  @IsOptional()
+  @IsString()
+  prestataire?: string;
+
+  @IsOptional()
+  @IsDecimal()
+  prix?: string;
+
+  @IsOptional()
+  @IsString()
+  emplacement?: string;
+
+  @IsOptional()
+  @IsString()
+  typeMachineId?: string;
+} 
\ No newline at end of file
diff --git a/src/shared/dto/piece.dto.ts b/src/shared/dto/piece.dto.ts
new file mode 100644
index 0000000..10be8ea
--- /dev/null
+++ b/src/shared/dto/piece.dto.ts
@@ -0,0 +1,63 @@
+import { IsString, IsOptional, IsNumber } from 'class-validator';
+import { Transform } from 'class-transformer';
+
+export class CreatePieceDto {
+  @IsString()
+  name: string;
+
+  @IsOptional()
+  @IsString()
+  machineId?: string;
+
+  @IsOptional()
+  @IsString()
+  composantId?: string;
+
+  @IsOptional()
+  @IsString()
+  reference?: string;
+
+  @IsOptional()
+  @IsString()
+  prestataire?: string;
+
+  @IsOptional()
+  @Transform(({ value }) => value === '' ? null : value)
+  @IsNumber({}, { message: 'prix must be a valid number' })
+  prix?: number | null;
+
+  @IsOptional()
+  @IsString()
+  emplacement?: string;
+
+  @IsOptional()
+  @IsString()
+  typePieceId?: string;
+}
+
+export class UpdatePieceDto {
+  @IsOptional()
+  @IsString()
+  name?: string;
+
+  @IsOptional()
+  @IsString()
+  reference?: string;
+
+  @IsOptional()
+  @IsString()
+  prestataire?: string;
+
+  @IsOptional()
+  @Transform(({ value }) => value === '' ? null : value)
+  @IsNumber({}, { message: 'prix must be a valid number' })
+  prix?: number | null;
+
+  @IsOptional()
+  @IsString()
+  emplacement?: string;
+
+  @IsOptional()
+  @IsString()
+  typePieceId?: string;
+} 
\ No newline at end of file
diff --git a/src/shared/dto/site.dto.ts b/src/shared/dto/site.dto.ts
new file mode 100644
index 0000000..d04155b
--- /dev/null
+++ b/src/shared/dto/site.dto.ts
@@ -0,0 +1,20 @@
+import { IsString, IsOptional } from 'class-validator';
+
+export class CreateSiteDto {
+  @IsString()
+  name: string;
+
+  @IsOptional()
+  @IsString()
+  description?: string;
+}
+
+export class UpdateSiteDto {
+  @IsOptional()
+  @IsString()
+  name?: string;
+
+  @IsOptional()
+  @IsString()
+  description?: string;
+} 
\ No newline at end of file
diff --git a/src/shared/dto/type.dto.ts b/src/shared/dto/type.dto.ts
new file mode 100644
index 0000000..07337dc
--- /dev/null
+++ b/src/shared/dto/type.dto.ts
@@ -0,0 +1,164 @@
+import { IsString, IsOptional, IsArray, IsObject, IsBoolean, IsEnum } from 'class-validator';
+
+export enum CustomFieldType {
+  TEXT = 'text',
+  NUMBER = 'number',
+  SELECT = 'select',
+  BOOLEAN = 'boolean',
+  DATE = 'date'
+}
+
+export class CreateCustomFieldDto {
+  @IsString()
+  name: string;
+
+  @IsEnum(CustomFieldType)
+  type: CustomFieldType;
+
+  @IsOptional()
+  @IsBoolean()
+  required?: boolean;
+
+  @IsOptional()
+  @IsString()
+  defaultValue?: string;
+
+  @IsOptional()
+  @IsArray()
+  options?: string[]; // Pour les champs de type SELECT
+}
+
+export class UpdateCustomFieldDto {
+  @IsOptional()
+  @IsString()
+  name?: string;
+
+  @IsOptional()
+  @IsEnum(CustomFieldType)
+  type?: CustomFieldType;
+
+  @IsOptional()
+  @IsBoolean()
+  required?: boolean;
+
+  @IsOptional()
+  @IsString()
+  defaultValue?: string;
+
+  @IsOptional()
+  @IsArray()
+  options?: string[];
+}
+
+export class CreateTypeMachineDto {
+  @IsString()
+  name: string;
+
+  @IsOptional()
+  @IsString()
+  description?: string;
+
+  @IsOptional()
+  @IsString()
+  category?: string;
+
+  @IsOptional()
+  @IsString()
+  maintenanceFrequency?: string;
+
+  @IsOptional()
+  @IsArray()
+  components?: any[];
+
+  @IsOptional()
+  @IsArray()
+  machinePieces?: string[];
+
+  @IsOptional()
+  @IsArray()
+  customFields?: CreateCustomFieldDto[];
+}
+
+export class UpdateTypeMachineDto {
+  @IsOptional()
+  @IsString()
+  name?: string;
+
+  @IsOptional()
+  @IsString()
+  description?: string;
+
+  @IsOptional()
+  @IsString()
+  category?: string;
+
+  @IsOptional()
+  @IsString()
+  maintenanceFrequency?: string;
+
+  @IsOptional()
+  @IsArray()
+  components?: any[];
+
+  @IsOptional()
+  @IsArray()
+  machinePieces?: string[];
+
+  @IsOptional()
+  @IsArray()
+  customFields?: CreateCustomFieldDto[];
+}
+
+export class CreateTypeComposantDto {
+  @IsString()
+  name: string;
+
+  @IsOptional()
+  @IsString()
+  description?: string;
+
+  @IsOptional()
+  @IsArray()
+  customFields?: CreateCustomFieldDto[];
+}
+
+export class UpdateTypeComposantDto {
+  @IsOptional()
+  @IsString()
+  name?: string;
+
+  @IsOptional()
+  @IsString()
+  description?: string;
+
+  @IsOptional()
+  @IsArray()
+  customFields?: CreateCustomFieldDto[];
+}
+
+export class CreateTypePieceDto {
+  @IsString()
+  name: string;
+
+  @IsOptional()
+  @IsString()
+  description?: string;
+
+  @IsOptional()
+  @IsArray()
+  customFields?: CreateCustomFieldDto[];
+}
+
+export class UpdateTypePieceDto {
+  @IsOptional()
+  @IsString()
+  name?: string;
+
+  @IsOptional()
+  @IsString()
+  description?: string;
+
+  @IsOptional()
+  @IsArray()
+  customFields?: CreateCustomFieldDto[];
+} 
\ No newline at end of file