NWPGCL Assistant Engineer (CSE)- 2019 Exam Taker: RUETপ্রশ্ন ও সমাধান

A Decision Support System (DSS) is a computer-based application that gathers, organizes, and analyzes business data to support semi-structured or unstructured decision-making by managers — typically through "what-if" analysis, models, and simulations rather than routine reporting.

Aspect	MIS	DSS
Full form	Management Information System	Decision Support System
Primary role	Reports pre-defined, structured information	Analyzes data to support specific, often unstructured decisions
Focus	Efficiency (routine operations)	Effectiveness (decision quality)
Data source	Corporate/transactional databases	Corporate data + special/external data, models
Nature of output	Fixed-format periodic reports	Interactive, flexible "what-if" analysis
Decision type supported	Structured, repetitive	Semi-structured / unstructured
Typical users	Middle management, supervisors	Analysts, managers, planners
Focus emphasis	Data storage & processing	Data manipulation, modeling & analysis

graph LR
  DB[(Corporate Data)] --> MIS[MIS: routine reports]
  DB --> DSS[DSS: models & what-if analysis]
  MIS --> Mgr1[Middle Management]
  DSS --> Mgr2[Analysts / Senior Managers]

Example: an MIS might generate a monthly sales report; a DSS lets a manager simulate "what happens to profit if we raise prices by 5% in Region A" using an interactive model before making the actual pricing decision.

Exam takeaway: MIS answers "what happened" with structured reports; DSS answers "what if / what should we do" by actively modeling and analyzing alternatives for less-structured decisions.