Using the decomposition model yt = Tt × St × It ,forecasts are made by _______,where 
and 
represent the estimated trend and the (adjusted) seasonal index for period t,respectively.
Definitions:
User Requirements
User Requirements define the needs, expectations, and constraints that users specify for a system or software product to solve a particular problem.
Shadow IT
Information technology projects managed outside of, and without the knowledge of, the IT department.
End-user Development
The practice allowing end-users to create or modify software applications or systems without professional programming skills.
Agile Development
A method of software development characterized by the division of tasks into short phases of work and frequent reassessment and adaptation of plans.
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