^{#smrgKİTABEVİ} The Art Of Effective Decision-Making Kuartet in the Age Of Uncertainty - 2026

The decision is on the table. The room has gone quiet. Everyone is waiting for you, and the waiting is not free. Most decisions do not deserve the same weight. We agonize over choices we could undo by Friday. We rush the ones that will outlive us. Kuartet sorts before it decides. First by reversibility. Some decisions are irreversible. Some you can simply take back. And some are returnable, but the return is costly. That middle kind is where boards quietly lose the most money, and most frameworks rush past it. Then by four parts that have to play in tune. Lifecycle. Capabilities. Sector Dynamics. Culture. Speed for what you can take back. Scrutiny for what will cost you. Alignment for what you cannot undo. I built this as an operator, not a consultant. When the four align, move. When they clash, the bill comes due later. Sort first. Then decide. HİLMİ GÜVENAL has spent more than forty years in business as an executive, entrepreneur, and investor. With expertise in institutional transformation and crisis management, he continues to serve as chairman, board member, and advisor to companies across multiple sectors and countries. His first book, Yol Yakınken, a handbook for effective executives, was named one of the three best business books of the year by Platin magazine in 2023. His second book, Kuartet, on the art of effective decision-making under uncertainty, appeared first in Turkish in 2025 and won Business Management Book of the Year at Ekonomi newspaper's 2025 awards in Türkiye. His third book, The Sediment, has been published by Remzi in 2026 both in Turkish and English. He is a graduate of Robert College, Boğaziçi University's Department of Industrial Engineering, and Harvard Business School's Executive Development Program. Born in Ankara in 1962, he has lived in Istanbul since 1968.