We examine key survival factors (KSF) and their evolution over the time since the start-up to the third year of existence of the newly founded firms. Our main objective in this work is to provide evidence to support the assumption that the key survival factors of a newly founded firm may change over the time. That statement would help to explain why so many researches have produced so many different results across the world and across the time.

Prior research on multidimensional analysis of newly founded firms’ survival reveals clearly 4 dimensions that seem crucial and widely accepted in scientific community, for understanding the KSF:

- The Entrepreneur,

- The Firm,

- The “Entrepreneurial process,”

- The External Environment,

As a result, a four-dimension model has been built to understand the phenomena.