The first needs that must be satisfied are the physiological (primary) needs until reaching the highest or abstract level of human needs, such as the needs for self-esteem and self-realization. Each of the hierarchy needs will be briefly explained:
• Physiological Needs: They constitute the lowest level of human needs. They are the innate needs: hunger, thirst, sleep, rest, shelter. They demand cyclical and continuous satisfaction to ensure survival. There is a continuous and constant search for the satisfaction of these elementary needs that cannot be postponed for long.
• Security needs: They constitute the second level of the hierarchy. They lead the person to protect themselves from any real or imaginary, physical or psychological danger. It manifests itself as a search for protection, a flight from danger, a need for order. They arise when physiological needs are relatively satisfied.
• Social needs: These are the needs for association, participation, acceptance, acceptance by colleagues, friendship, affection and love. They arise in behavior when elementary needs (physiological and safety) are relatively satisfied.
• Self-esteem needs: They relate to self-evaluation and self-esteem, self-confidence, self-confidence, the need for approval and social recognition, status, prestige, reputation and consideration. Meeting these needs leads to feelings of self-confidence, worth, strength, prestige, power, ability, and usefulness.
• Self-actualization needs: They are at the top of the hierarchy, they lead people to develop their own potential and fulfill themselves as human creatures throughout life, it is the impulse to improve themselves more and more. They are related to autonomy, independence, self-control, competence, and full realization of the potential of each person, of individual talents.
Meeting these needs leads to feelings of self-confidence, worth, strength, prestige, power, ability, and usefulness.
Their frustration can lead to feelings of inferiority, weakness, dependency, and helplessness, which in turn can lead to discouragement or compensatory activities.
In summary, Maslow's contributions to the understanding of human motivation can be summarized in the following statements:
• A satisfied need does not motivate any behavior; only unmet needs. Employees are more enthusiastic about what they seek than what they already own.
• At first the behavior revolves around the satisfaction of physiological needs.
• From a certain age, the individual begins a long learning of new patterns of needs. Physiological and safety needs are the primary needs of the individual, and are related to their personal preservation.
• Self-esteem needs are complementary to social needs, while self-fulfillment needs complement self-esteem. The highest levels of needs only arise when the individual relatively satisfies the lowest levels of needs.
• The higher needs do not arise as the lower ones are being satisfied, since they predominate, according to the hierarchy.
• Primary needs require a rapid motivational cycle, while secondary needs require a much longer one.
Despite the usefulness of the hierarchy of needs proposed by Maslow, it is necessary to point out some limitations of this theory:
• It is difficult to verify and study, scientifically. It has not been fully verified.
• Research does not support the presence of the five levels of needs as unique, nor has the progression of five levels of needs from the lowest to the highest been established.