IN COMPLEX SYSTEMS WHERE PROCESSES ARE CONTROLLED WITH THE AID OF COMPUTERS (COMMUNICATIONS, POWE INDUSTRY, TRANSPORTATION, ETC.), IT IS OFTEN NEEDED TO REFER EVENTS TO ONE COORDINATED TIME SCALE OR AT LEST TO TIME SCALE WHICH ARE NOT DIVERGENT. TO ENSURE THIS, THE COMPUTERS MUST BE SYNCHRONIZED, PREFERABLY TO THE UNIVERSAL COORDINATED TIME (UTC), OR AT LEAST SYNTONIZED. THIS PAPER PRESENTS MODEL EQUATIONS FOR SYNTONIZATION AND SYNCHRONIZATION OF CLOCKS ALONG WHITH MEASURES THAT ALLOW ASSESSING THE SYNCHONIZATION QUALITY (STABILITY AND ACCURANCY). ALSO THE DIFFERENCE BETWEEN CLOCK SYNCHRONIZATION AND COMPUTER SYNCHONIZATION IS SISCUSSED. THE FINAL PART OF THE PAPER IS DEDICATED TO THE PERFORMENCE OF THREE UTC DISSEMINATION (GPS, LONG - WAVE TRANSMISSIONS, AND TELEPHONE).IN COMPLEX SYSTEMS WHERE PROCESSES ARE CONTROLLED WITH THE AID OF COMPUTERS (COMMUNICATIONS, POWE INDUSTRY, TRANSPORTATION, ETC.), IT IS OFTEN NEEDED TO REFER EVENTS TO ONE COORDINATED TIME SCALE OR AT LEST TO TIME SCALE WHICH ARE NOT DIVERGENT. TO ENSURE THIS, THE COMPUTERS MUST BE SYNCHRONIZED, PREFERABLY TO THE UNIVERSAL COORDINATED TIME (UTC), OR AT LEAST SYNTONIZED. THIS PAPER PRESENTS MODEL EQUATIONS FOR SYNTONIZATION AND SYNCHRONIZATION OF CLOCKS ALONG WHITH MEASURES THAT ALLOW ASSESSING THE SYNCHONIZATION QUALITY (STABILITY AND ACCURANCY). ALSO THE DIFFERENCE BETWEEN CLOCK SYNCHRONIZATION AND COMPUTER SYNCHONIZATION IS SISCUSSED. THE FINAL PART OF THE PAPER IS DEDICATED TO THE PERFORMENCE OF THREE UTC DISSEMINATION (GPS, LONG - WAVE TRANSMISSIONS, AND TELEPHONE).