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: affected with or expressive of grief or unhappiness : downcast. b(1) : causing or associated with grief or unhappiness : depressing.

Seasonal affective disorder (SAD) is a type of depression that comes and goes in a seasonal pattern. SAD is sometimes known as "winter depression" because the symptoms are usually more apparent and more severe during the winter.

SAD is sometimes known as “winter depression” because the symptoms are more apparent and tend to be more severe at this time of the year. The symptoms often begin in the autumn as the days start getting shorter. They are most severe during December, January and February.

Analyzes the business needs and integrates technology into the organization by designing and utilizing models and methodologies to simulate deployment. Distinguishes between outcome (what the system needs to achieve) and output (what the system does).

In business, System Analysis and Design refers to the process of examining a business situation with the intent of improving it through better procedures and methods. System analysis and design relates to shaping organizations, improving performance and achieving objectives for profitability and growth.

Open or Closed Systems. An open system must interact with its environment. It receives inputs from and delivers outputs to the outside of the system. For example, an information system which must adapt to the changing environmental conditions. A closed system does not interact with its environment.

About sadness All these emotions can occur in response to a negative or unexpected situations, or life changes. Sadness often occurs at the same time as other feelings, such as anger, stress, guilt, grief, anxiety or hopelessness. Sometimes, the other feeling may be so strong that you don't realise you are sad.

It is a problem solving technique that improves the system and ensures that all the components of the system work efficiently to accomplish their purpose.