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diff --git a/archivos.c b/archivos.c
new file mode 100644
index 0000000..9d18bf4
--- /dev/null
+++ b/archivos.c
@@ -0,0 +1,73 @@
+//
+//
+//   archivos.c
+//
+//   Created by Sergio Medina Galàn and Gustavo Luna Maya on 12/09/2020
+//
+//
+
+
+/*Include standard headers*/
+#include<stdio.h>
+#include<stdlib.h>
+#include<string.h>
+
+/*Include modules header we directly invoke here: */
+#include"archivos.h"
+
+/**
+ * Initialises a new file pointer identified via its name and mode.
+ * @param
+ *  name (char *):
+ *      Name of the file
+ *  mode (char *):
+ *      Mode of file to be opened {r, rb, a, ab, w, wb}
+ *
+ * @return FILE * opened_file.
+*/
+extern FILE * file_new( char * name, char *mode)
+{
+  FILE *fp;
+  fp = fopen(name,mode);
+  return fp;
+}
+
+
+/**
+ * Writes a bidimensional buffer array into a file.
+ * @param
+ *  file (FILE *):
+ *      Storage file
+ *  columns (size_t ):
+ *      length of the buffer array
+ *  buff [ ][columns] (long double):
+ *      RAM matrix
+ *  rows (size_t):
+ *      width of the storage buffer
+ *
+ * @return void.
+*/
+extern void file_num_write(FILE * file, size_t columns, long double buff[] [columns], size_t rows)
+{
+   char linea[10];
+   sprintf(linea,"%zu %zu \n",rows,columns);
+   // fputs (linea, file);
+  for (size_t i =0; i<rows; i++){
+    linea[0] = '\0';
+   
+
+      char buffer[8];
+      for(int j =0; j<=2; j++){
+    fprintf(file,"%1.5Lf \t",buff[i][j]);
+   
+      strcat(linea,buffer);
+      }
+      fprintf(file,"\n");
+      int len = strlen(linea);
+    linea[len-1] = '\n'; 
+    fputs(linea,file);
+      
+    }
+    }
+    
+  
diff --git a/archivos.c~ b/archivos.c~
new file mode 100644
index 0000000..d840f7f
--- /dev/null
+++ b/archivos.c~
@@ -0,0 +1,73 @@
+//
+//
+//   files.c
+//
+//   Created by Sergio Medina Galàn and Gustavo Luna Maya on 12/09/2020
+//
+//
+
+
+/*Include standard headers*/
+#include<stdio.h>
+#include<stdlib.h>
+#include<string.h>
+
+/*Include modules header we directly invoke here: */
+#include"files.h"
+
+/**
+ * Initialises a new file pointer identified via its name and mode.
+ * @param
+ *  name (char *):
+ *      Name of the file
+ *  mode (char *):
+ *      Mode of file to be opened {r, rb, a, ab, w, wb}
+ *
+ * @return FILE * opened_file.
+*/
+extern FILE * file_new( char * name, char *mode)
+{
+  FILE *fp;
+  fp = fopen(name,mode);
+  return fp;
+}
+
+
+/**
+ * Writes a bidimensional buffer array into a file.
+ * @param
+ *  file (FILE *):
+ *      Storage file
+ *  columns (size_t ):
+ *      length of the buffer array
+ *  buff [ ][columns] (long double):
+ *      RAM matrix
+ *  rows (size_t):
+ *      width of the storage buffer
+ *
+ * @return void.
+*/
+extern void file_num_write(FILE * file, size_t columns, long double buff[] [columns], size_t rows)
+{
+   char linea[10];
+   sprintf(linea,"%zu %zu \n",rows,columns);
+   // fputs (linea, file);
+  for (size_t i =0; i<rows; i++){
+    linea[0] = '\0';
+   
+
+      char buffer[8];
+      for(int j =0; j<=2; j++){
+    fprintf(file,"%1.5Lf \t",buff[i][j]);
+   
+      strcat(linea,buffer);
+      }
+      fprintf(file,"\n");
+      int len = strlen(linea);
+    linea[len-1] = '\n'; 
+    fputs(linea,file);
+      
+    }
+    }
+    
+  
diff --git a/archivos.h b/archivos.h
new file mode 100644
index 0000000..58bd658
--- /dev/null
+++ b/archivos.h
@@ -0,0 +1,58 @@
+//
+//  archivos.h
+//  
+//
+//  Created by Cesar Angeles on 07/09/2020.
+//
+
+#ifndef files_h
+#define files_h
+
+#include <stdio.h>
+
+#ifdef files_IMPORT
+    #define EXTERN
+#else
+    #define EXTERN extern
+#endif
+
+
+/* files.h -- Function prototypes */
+
+/**
+ * Instanciates a new file pointer identified via its name and mode.
+ * @param
+ *  name (char *):
+ *      Name of the file
+ *  mode (char *):
+ *      Mode of file to be opened {r, rb, a, ab, w, wb}
+ *
+ * @return FILE * opened_file.
+*/
+EXTERN FILE * file_new(char *name, char *mode);
+
+
+
+/**
+ * Writes a bidimensional buffer array into a file.
+ * @param
+ *  file (FILE *):
+ *      Storage file
+ *  columns (size_t ):
+ *      length of the buffer array
+ *  buff [ ][columns] (long double):
+ *      RAM matrix
+ *  rows (size_t):
+ *      width of the storage buffer
+ *
+ * @return void.
+*/
+
+EXTERN void file_num_write(FILE * file, size_t columns, long double buff[] [columns], size_t rows);
+
+#undef files_IMPORT
+#undef EXTERN
+
+
+
+#endif /* files_h */
diff --git a/archivos.h~ b/archivos.h~
new file mode 100644
index 0000000..7ddc38b
--- /dev/null
+++ b/archivos.h~
@@ -0,0 +1,58 @@
+//
+//  files.h
+//  
+//
+//  Created by Cesar Angeles on 07/09/2020.
+//
+
+#ifndef files_h
+#define files_h
+
+#include <stdio.h>
+
+#ifdef files_IMPORT
+    #define EXTERN
+#else
+    #define EXTERN extern
+#endif
+
+
+/* files.h -- Function prototypes */
+
+/**
+ * Instanciates a new file pointer identified via its name and mode.
+ * @param
+ *  name (char *):
+ *      Name of the file
+ *  mode (char *):
+ *      Mode of file to be opened {r, rb, a, ab, w, wb}
+ *
+ * @return FILE * opened_file.
+*/
+EXTERN FILE * file_new(char *name, char *mode);
+
+
+
+/**
+ * Writes a bidimensional buffer array into a file.
+ * @param
+ *  file (FILE *):
+ *      Storage file
+ *  columns (size_t ):
+ *      length of the buffer array
+ *  buff [ ][columns] (long double):
+ *      RAM matrix
+ *  rows (size_t):
+ *      width of the storage buffer
+ *
+ * @return void.
+*/
+
+EXTERN void file_num_write(FILE * file, size_t columns, long double buff[] [columns], size_t rows);
+
+#undef files_IMPORT
+#undef EXTERN
+
+
+
+#endif /* files_h */
diff --git a/funcionesfibo.c b/funcionesfibo.c
new file mode 100644
index 0000000..2c36fe7
--- /dev/null
+++ b/funcionesfibo.c
@@ -0,0 +1,50 @@
+//
+//
+//   funcionesfibo.c
+//
+//   Created by Sergio Medina Galàn and Gustavo Luna Maya on 12/09/2020
+//
+//
+
+
+/*Inlcude standard headers*/
+#include <stdio.h>
+
+/*Inlude modules header we directly invoke here: */
+#include "funcionesfibo.h"
+
+
+/**
+ * Returns the value of the fibonacci sequence at index n calculated recursively
+ * @param
+ *      n (long long int):
+ *          Index of the fibonacci sequence
+ * @return long long int value
+*/
+extern long long int Sequences_rfibo(long long int n)
+{
+  if (n==0 || n ==1)
+    return n;
+  else
+    return Sequences_rfibo(n-2) + Sequences_rfibo(n-1);
+      }
+
+/**
+ * Returns the value of the fibonacci sequence at index n calculated sequentially
+ * @param
+ *      n (long long int):
+ *          Index of the fibonacci sequence
+ * @return long long int value
+*/
+extern long long int Sequences_sfibo(long long int n)
+{
+  long long int p=0,s=1,u;
+  int i;
+  for(i=0; i<=n;i++){
+    u=p+s;
+    p=s;
+    s=u;
+   
+      }
+  return u;
+}
diff --git a/funcionesfibo.c~ b/funcionesfibo.c~
new file mode 100644
index 0000000..eb82119
--- /dev/null
+++ b/funcionesfibo.c~
@@ -0,0 +1,50 @@
+//
+//
+//   Sequences.c
+//
+//   Created by Sergio Medina Galàn and Gustavo Luna Maya on 12/09/2020
+//
+//
+
+
+/*Inlcude standard headers*/
+#include <stdio.h>
+
+/*Inlude modules header we directly invoke here: */
+#include "Sequences.h"
+
+
+/**
+ * Returns the value of the fibonacci sequence at index n calculated recursively
+ * @param
+ *      n (long long int):
+ *          Index of the fibonacci sequence
+ * @return long long int value
+*/
+extern long long int Sequences_rfibo(long long int n)
+{
+  if (n==0 || n ==1)
+    return n;
+  else
+    return Sequences_rfibo(n-2) + Sequences_rfibo(n-1);
+      }
+
+/**
+ * Returns the value of the fibonacci sequence at index n calculated sequentially
+ * @param
+ *      n (long long int):
+ *          Index of the fibonacci sequence
+ * @return long long int value
+*/
+extern long long int Sequences_sfibo(long long int n)
+{
+  long long int p=0,s=1,u;
+  int i;
+  for(i=0; i<=n;i++){
+    u=p+s;
+    p=s;
+    s=u;
+   
+      }
+  return u;
+}
diff --git a/funcionesfibo.h b/funcionesfibo.h
new file mode 100644
index 0000000..11d5bc1
--- /dev/null
+++ b/funcionesfibo.h
@@ -0,0 +1,44 @@
+//
+//  funcionesfibo.h
+//  
+//
+//  Created by Cesar Angeles on 07/09/2020.
+//
+
+#ifndef Sequences_h
+#define Sequences_h
+
+#include <stdio.h>
+
+#ifdef Sequences_IMPORT
+    #define EXTERN
+#else
+    #define EXTERN extern
+#endif
+
+
+/* Sequences.h -- Function prototypes */
+
+/**
+ * Returns the value of the fibonacci sequence at index n calculated sequentially
+ * @param
+ *      n (long long int):
+ *          Index of the fibonacci sequence
+ * @return long long int value
+*/
+EXTERN long long int Sequences_sfibo(long long int n);
+
+
+/**
+ * Returns the value of the fibonacci sequence at index n calculated recursively
+ * @param
+ *      n (long long int):
+ *          Index of the fibonacci sequence
+ * @return long long int value
+*/
+EXTERN long long int Sequences_rfibo(long long int n);
+
+
+#undef Sequences_IMPORT
+#undef EXTERN
+#endif /* Sequences_h */
diff --git a/funcionesfibo.h~ b/funcionesfibo.h~
new file mode 100644
index 0000000..dac8ae0
--- /dev/null
+++ b/funcionesfibo.h~
@@ -0,0 +1,44 @@
+//
+//  Sequences.h
+//  
+//
+//  Created by Cesar Angeles on 07/09/2020.
+//
+
+#ifndef Sequences_h
+#define Sequences_h
+
+#include <stdio.h>
+
+#ifdef Sequences_IMPORT
+    #define EXTERN
+#else
+    #define EXTERN extern
+#endif
+
+
+/* Sequences.h -- Function prototypes */
+
+/**
+ * Returns the value of the fibonacci sequence at index n calculated sequentially
+ * @param
+ *      n (long long int):
+ *          Index of the fibonacci sequence
+ * @return long long int value
+*/
+EXTERN long long int Sequences_sfibo(long long int n);
+
+
+/**
+ * Returns the value of the fibonacci sequence at index n calculated recursively
+ * @param
+ *      n (long long int):
+ *          Index of the fibonacci sequence
+ * @return long long int value
+*/
+EXTERN long long int Sequences_rfibo(long long int n);
+
+
+#undef Sequences_IMPORT
+#undef EXTERN
+#endif /* Sequences_h */
diff --git a/timetest.c b/timetest.c
new file mode 100644
index 0000000..89db07b
--- /dev/null
+++ b/timetest.c
@@ -0,0 +1,60 @@
+//
+//  time_test_fibo.c
+//  
+//
+//  Created by Cesar Angeles on 07/09/2020.
+//
+
+/*Include standard headers*/
+#include <stdio.h>
+#include <stdlib.h>
+#include <time.h>
+
+/*Include modules header we directly invoke here: */
+#include "funcionesfibo.h"
+#include "archivos.h"
+#include "timetest.h"
+
+/*The function main */
+int main(void){
+
+  long long int value =0;
+  int index =0;
+  clock_t start, stop;
+  double cput =0;
+  double mean =0;  
+  FILE * record = NULL;
+  long double buffer [OBSERVATIONS][VALUES] ={0};
+  size_t obs =0;
+
+  record = file_new("FIBO_TIME.dat","w");
+
+  for(obs=0; obs < OBSERVATIONS; obs++){
+    printf(" %zu\n",obs);
+    start = clock();
+    for( index=0; index <= 100; index++){
+      Sequences_rfibo(obs);
+    }
+    stop = clock();
+
+    cput= ((double)(stop-start)) /CLOCKS_PER_SEC /100;
+     buffer[obs][0] = obs;
+     buffer[obs][1] = cput;
+    printf("Recursiva %f  s \t", cput);
+
+    
+        start = clock();
+    for( index=0; index <= 100; index++){
+      Sequences_sfibo(obs);
+    }
+    stop = clock();
+
+    cput= ((double)(stop-start)) /CLOCKS_PER_SEC /100;
+   
+     buffer[obs][2] = cput*1e3;
+     printf("Secuencial %f  ms \t", cput*1e3);
+    }
+  file_num_write(record, VALUES, buffer, OBSERVATIONS);
+  fclose(record);
+}
+
diff --git a/timetest.c~ b/timetest.c~
new file mode 100644
index 0000000..f8a1af1
--- /dev/null
+++ b/timetest.c~
@@ -0,0 +1,60 @@
+//
+//  time_test_fibo.c
+//  
+//
+//  Created by Cesar Angeles on 07/09/2020.
+//
+
+/*Include standard headers*/
+#include <stdio.h>
+#include <stdlib.h>
+#include <time.h>
+
+/*Include modules header we directly invoke here: */
+#include "Sequences.h"
+#include "files.h"
+#include "time_test_fibo.h"
+
+/*The function main */
+int main(void){
+
+  long long int value =0;
+  int index =0;
+  clock_t start, stop;
+  double cput =0;
+  double mean =0;  
+  FILE * record = NULL;
+  long double buffer [OBSERVATIONS][VALUES] ={0};
+  size_t obs =0;
+
+  record = file_new("FIBO_TIME.dat","w");
+
+  for(obs=0; obs < OBSERVATIONS; obs++){
+    printf(" %zu\n",obs);
+    start = clock();
+    for( index=0; index <= 100; index++){
+      Sequences_rfibo(obs);
+    }
+    stop = clock();
+
+    cput= ((double)(stop-start)) /CLOCKS_PER_SEC /100;
+     buffer[obs][0] = obs;
+     buffer[obs][1] = cput;
+    printf("Recursiva %f  s \t", cput);
+
+    
+        start = clock();
+    for( index=0; index <= 100; index++){
+      Sequences_sfibo(obs);
+    }
+    stop = clock();
+
+    cput= ((double)(stop-start)) /CLOCKS_PER_SEC /100;
+   
+     buffer[obs][2] = cput*1e3;
+     printf("Secuencial %f  ms \t", cput*1e3);
+    }
+  file_num_write(record, VALUES, buffer, OBSERVATIONS);
+  fclose(record);
+}
+
diff --git a/timetest.h b/timetest.h
new file mode 100644
index 0000000..d6e3ddd
--- /dev/null
+++ b/timetest.h
@@ -0,0 +1,20 @@
+//
+//  time_test_fibo.h
+//  
+//
+//  Created by Cesar Angeles on 07/09/2020.
+//
+
+#ifndef time_test_fibo_h
+#define time_test_fibo_h
+
+#include <stdio.h>
+#include "archivos.h"
+
+
+#define STATISTIC 
+#define OBSERVATIONS 25
+#define VALUES 3
+
+#endif
+
diff --git a/timetest.h~ b/timetest.h~
new file mode 100644
index 0000000..16d4688
--- /dev/null
+++ b/timetest.h~
@@ -0,0 +1,20 @@
+//
+//  time_test_fibo.h
+//  
+//
+//  Created by Cesar Angeles on 07/09/2020.
+//
+
+#ifndef time_test_fibo_h
+#define time_test_fibo_h
+
+#include <stdio.h>
+#include "files.h"
+
+
+#define STATISTIC 
+#define OBSERVATIONS 25
+#define VALUES 3
+
+#endif
+