diff --git a/src/eestec/portal/const.py b/src/eestec/portal/const.py
index c59811a..41ef564 100644
--- a/src/eestec/portal/const.py
+++ b/src/eestec/portal/const.py
@@ -1,26 +1,276 @@
 # -*- coding: utf-8 -*-
 """Global constants."""
 
-STUDY_FIELDS = [
-    'ece',
-    'electrical engineering',
-    'engineering of electics',
-    'electrical'
-]
+STUDY_FIELDS = (
+    ('ee', 'Electrical Engineering'),
+    ('it', 'Information Technology'),
+    ('cc', 'Computer Science'),
+    ('be', 'Biomedical Engineering'),
+    ('tc', 'Telecommunications'),
+    ('pe', 'Power Engineering'),
+    ('se', 'Software Engineering'),
+    ('am', 'Automatics'),
+    ('ns', 'Natural Sciences'),
+    ('ss', 'Social Sciences'),
+    ('otef', 'Other technical engineering fields'),
+)
 
 SEXES = [
     'male',
     'female'
 ]
 
-COUNTRIES = [
-    'greece',
-    'USA',
-    'other countries'
-]
-
 TSHIRT_SIZES = [
     'Large',
     'Medium',
     'Small'
 ]
+
+COUNTRIES = (
+    ('ABW', 'Aruba'),
+    ('AFG', 'Afghanistan'),
+    ('AGO',	'Angola'),
+    ('AIA', 'Anguilla'),
+    ('ALA', 'Åland Islands'),
+    ('ALB', 'Albania'),
+    ('AND', 'Andorra'),
+    ('ANT', 'Netherlands Antilles'),
+    ('ARE', 'United Arab Emirates'),
+    ('ARG', 'Argentina'),
+    ('ARM', 'Armenia'),
+    ('ASM', 'American Samoa'),
+    ('ATA', 'Antarctica'),
+    ('ATF', 'French Southern Territories'),
+    ('ATG', 'Antigua and Barbuda'),
+    ('AUS', 'Australia'),
+    ('AUT', 'Austria'),
+    ('AZE', 'Azerbaijan'),
+    ('BDI', 'Burundi'),
+    ('BEL', 'Belgium'),
+    ('BEN', 'Benin'),
+    ('BFA', 'Burkina Faso'),
+    ('BGD', 'Bangladesh'),
+    ('BGR', 'Bulgaria'),
+    ('BHR', 'Bahrain'),
+    ('BHS', 'Bahamas'),
+    ('BIH', 'Bosnia and Herzegovina'),
+    ('BLM', 'Saint Barthélemy'),
+    ('BLR', 'Belarus'),
+    ('BLZ', 'Belize'),
+    ('BMU', 'Bermuda'),
+    ('BOL', 'Bolivia, Plurinational State of'),
+    ('BRA', 'Brazil'),
+    ('BRB', 'Barbados'),
+    ('BRN', 'Brunei Darussalam'),
+    ('BTN', 'Bhutan'),
+    ('BVT', 'Bouvet Island'),
+    ('BWA', 'Botswana'),
+    ('CAF', 'entral African Republic'),
+    ('CAN', 'Canada'),
+    ('CCK', 'Cocos (Keeling) Islands'),
+    ('CHE', 'Switzerland'),
+    ('CHL', 'Chile'),
+    ('CHN', 'China'),
+    ('CIV', 'Côte d\'Ivoire'),
+    ('CMR', 'Cameroon'),
+    ('COD', 'Congo, the Democratic Republic of the'),
+    ('COG', 'Congo'),
+    ('COK', 'Cook Islands'),
+    ('COL', 'Colombia'),
+    ('COM', 'Comoros'),
+    ('CPV', 'Cape Verde'),
+    ('CRI', 'Costa Rica'),
+    ('CUB', 'Cuba'),
+    ('CXR', 'Christmas Island'),
+    ('CYM', 'Cayman Islands'),
+    ('CYP', 'Cyprus'),
+    ('CZE', 'Czech Republic'),
+    ('DEU', 'Germany'),
+    ('DJI', 'Djibouti'),
+    ('DMA', 'Dominica'),
+    ('DNK', 'Denmark'),
+    ('DOM', 'Dominican Republic'),
+    ('DZA', 'Algeria'),
+    ('ECU', 'Ecuador'),
+    ('EGY', 'Egypt'),
+    ('ERI', 'Eritrea'),
+    ('ESH', 'Western Sahara'),
+    ('ESP', 'Spain'),
+    ('EST', 'Estonia'),
+    ('ETH', 'Ethiopia'),
+    ('FIN', 'Finland'),
+    ('FJI', 'Fiji'),
+    ('FLK', 'Falkland Islands (Malvinas)'),
+    ('FRA', 'France'),
+    ('FRO', 'Faroe Islands'),
+    ('FSM', 'Micronesia, Federated States of'),
+    ('GAB', 'Gabon'),
+    ('GBR', 'United Kingdom'),
+    ('GEO', 'Georgia'),
+    ('GGY', 'Guernsey'),
+    ('GHA', 'Ghana'),
+    ('GIB', 'Gibraltar'),
+    ('GIN', 'Guinea'),
+    ('GLP', 'Guadeloupe'),
+    ('GMB', 'Gambia'),
+    ('GNB', 'Guinea-Bissau'),
+    ('GNQ', 'Equatorial Guinea'),
+    ('GRC', 'Greece'),
+    ('GRD', 'Grenada'),
+    ('GRL', 'Greenland'),
+    ('GTM', 'Guatemala'),
+    ('GUF', 'French Guiana'),
+    ('GUM', 'Guam'),
+    ('GUY', 'Guyana'),
+    ('HKG', 'Hong Kong'),
+    ('HMD', 'Heard Island and McDonald Islands'),
+    ('HND', 'Honduras'),
+    ('HRV', 'Croatia'),
+    ('HTI', 'Haiti'),
+    ('HUN', 'Hungary'),
+    ('IDN', 'Indonesia'),
+    ('IMN', 'Isle of Man'),
+    ('IND', 'India'),
+    ('IOT', 'British Indian Ocean Territory'),
+    ('IRL', 'Ireland'),
+    ('IRN', 'Iran, Islamic Republic of'),
+    ('IRQ', 'Iraq'),
+    ('ISL', 'Iceland'),
+    ('ISR', 'Israel'),
+    ('ITA', 'Italy'),
+    ('JAM', 'Jamaica'),
+    ('JEY', 'Jersey'),
+    ('JOR', 'Jordan'),
+    ('JPN', 'Japan'),
+    ('KAZ', 'Kazakhstan'),
+    ('KEN', 'Kenya'),
+    ('KGZ', 'Kyrgyzstan'),
+    ('KHM', 'Cambodia'),
+    ('KIR', 'Kiribati'),
+    ('KNA', 'Saint Kitts and Nevis'),
+    ('KOR', 'Korea, Republic of'),
+    ('KWT', 'Kuwait'),
+    ('LAO', 'Lao People\'s Democratic Republic'),
+    ('LBN', 'Lebanon'),
+    ('LBR', 'Liberia'),
+    ('LBY', 'Libyan Arab Jamahiriya'),
+    ('LCA', 'Saint Lucia'),
+    ('LIE', 'Liechtenstein'),
+    ('LKA', 'Sri Lanka'),
+    ('LSO', 'Lesotho'),
+    ('LTU', 'Lithuania'),
+    ('LUX', 'Luxembourg'),
+    ('LVA', 'Latvia'),
+    ('MAC', 'Macao'),
+    ('MAF', 'Saint Martin (French part)'),
+    ('MAR', 'Morocco'),
+    ('MCO', 'Monaco'),
+    ('MDA', 'Moldova, Republic of'),
+    ('MDG', 'Madagascar'),
+    ('MDV', 'Maldives'),
+    ('MEX', 'Mexico'),
+    ('MHL', 'Marshall Islands'),
+    ('MKD', 'Macedonia, the former Yugoslav Republic of'),
+    ('MLI', 'Mali'),
+    ('MLT', 'Malta'),
+    ('MMR', 'Myanmar'),
+    ('MNE', 'Montenegro'),
+    ('MNG', 'Mongolia'),
+    ('MNP', 'Northern Mariana Islands'),
+    ('MOZ', 'Mozambique'),
+    ('MRT', 'Mauritania'),
+    ('MSR', 'Montserrat'),
+    ('MTQ', 'Martinique'),
+    ('MUS', 'Mauritius'),
+    ('MWI', 'Malawi'),
+    ('MYS', 'Malaysia'),
+    ('MYT', 'Mayotte'),
+    ('NAM', 'Namibia'),
+    ('NCL', 'New Caledonia'),
+    ('NER', 'Niger'),
+    ('NFK', 'Norfolk Island'),
+    ('NGA', 'Nigeria'),
+    ('NIC', 'Nicaragua'),
+    ('NIU', 'Niue'),
+    ('NLD', 'Netherlands'),
+    ('NOR', 'Norway'),
+    ('NPL', 'Nepal'),
+    ('NRU', 'Nauru'),
+    ('NZL', 'New Zealand'),
+    ('OMN', 'Oman'),
+    ('PAK', 'Pakistan'),
+    ('PAN', 'Panama'),
+    ('PCN', 'Pitcairn'),
+    ('PER', 'Peru'),
+    ('PHL', 'Philippines'),
+    ('PLW', 'Palau'),
+    ('PNG', 'Papua New Guinea'),
+    ('POL', 'Poland'),
+    ('PRI', 'Puerto Rico'),
+    ('PRK', 'Korea, Democratic People\'s Republic of'),
+    ('PRT', 'Portugal'),
+    ('PRY', 'Paraguay'),
+    ('PSE', 'Palestinian Territory, Occupied'),
+    ('PYF', 'French Polynesia'),
+    ('QAT', 'Qatar'),
+    ('REU', 'Réunion'),
+    ('ROU', 'Romania'),
+    ('RUS', 'Russian Federation'),
+    ('RWA', 'Rwanda'),
+    ('SAU', 'Saudi Arabia'),
+    ('SDN', 'Sudan'),
+    ('SEN', 'Senegal'),
+    ('SGP', 'Singapore'),
+    ('SGS', 'South Georgia and the South Sandwich Islands'),
+    ('SHN', 'Saint Helena, Ascension and Tristan da Cunha'),
+    ('SJM', 'Svalbard and Jan Mayen'),
+    ('SLB', 'Solomon Islands'),
+    ('SLE', 'Sierra Leone'),
+    ('SLV', 'El Salvador'),
+    ('SMR', 'San Marino'),
+    ('SOM', 'Somalia'),
+    ('SPM', 'Saint Pierre and Miquelon'),
+    ('SRB', 'Serbia'),
+    ('STP', 'Sao Tome and Principe'),
+    ('SUR', 'Suriname'),
+    ('SVK', 'Slovakia'),
+    ('SVN', 'Slovenia'),
+    ('SWE', 'Sweden'),
+    ('SWZ', 'Swaziland'),
+    ('SYC', 'Seychelles'),
+    ('SYR', 'Syrian Arab Republic'),
+    ('TCA', 'Turks and Caicos Islands'),
+    ('TCD', 'Chad'),
+    ('TGO', 'Togo'),
+    ('THA', 'Thailand'),
+    ('TJK', 'Tajikistan'),
+    ('TKL', 'Tokelau'),
+    ('TKM', 'Turkmenistan'),
+    ('TLS', 'Timor-Leste'),
+    ('TON', 'Tonga'),
+    ('TTO', 'Trinidad and Tobago'),
+    ('TUN', 'Tunisia'),
+    ('TUR', 'Turkey'),
+    ('TUV', 'Tuvalu'),
+    ('TWN', 'Taiwan, Province of China'),
+    ('TZA', 'Tanzania, United Republic of'),
+    ('UGA', 'Uganda'),
+    ('UKR', 'Ukraine'),
+    ('UMI', 'United States Minor Outlying Islands'),
+    ('URY', 'Uruguay'),
+    ('USA', 'United States'),
+    ('UZB', 'Uzbekistan'),
+    ('VAT', 'Holy See (Vatican City State)'),
+    ('VCT', 'Saint Vincent and the Grenadines'),
+    ('VEN', 'Venezuela, Bolivarian Republic of'),
+    ('VGB', 'Virgin Islands, British'),
+    ('VIR', 'Virgin Islands, U.S.'),
+    ('VNM', 'Viet Nam'),
+    ('VUT', 'Vanuatu'),
+    ('WLF', 'Wallis and Futuna'),
+    ('WSM', 'Samoa'),
+    ('YEM', 'Yemen'),
+    ('ZAF', 'South Africa'),
+    ('ZMB', 'Zambia'),
+    ('ZWE', 'Zimbabwe'),
+)