Garbage in, garbage out (GIGO) is the most important rule in financial modelling: your forecast can only be as good as your inputs. This lecture explains how flawed historical data and unrealistic assumptions produce convincing but useless results, and how to source, check and document assumptions properly.

In this episode:

• What GIGO means in practice
• Checking historical data before you use it
• Setting realistic, defensible assumptions
• Documenting sources so others can trust your model

📖 Full blog post: https://modeloop.net/Blog/P1E6-GIGO-The-Most-Important-Rule-in-Modeling-Garbage-In-Garbage-Out
📺 Watch the video lecture: https://youtu.be/B_EDYSMCc9w
🎓 Courses: Excel for Financial Modelling | AI in Project Finance Modelling
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ModeLoop is hosted by Samir Asadov, CFA, ranked top 3 financial modeller worldwide (FMWC), with 15 years in M&A and project finance for renewables.