Read the case study Marketing Decisions for Managers Case Analysis Framework - PACADI Approach and write about following:
Problem definition - major challenge or key opportunity
Alternatives - identification and discussion
Criteria - list of key factors, rationale, and weights that are used in the analysis, and impact how the decision is made
Analysis - how you made/will make your decision
Decision - you're proposed solution to the problem
Implementation plan - recommendations, expected competitive reaction, budget, actions, timetable, and other useful metrics