掌上型電腦與智慧型手機產業之總體發展　以Palm Inc. 為論述主體 / The earliest concept of PDA can be seen in one of most popular TV fictional series “Star Trek” back in 60’s. However, PDA was not available for general market until 80’s and it didn’t become popular until early 90’s. During the revolution of the PDA, the so called definition of PDA has also been differed from one’s point of view to another. Apple Inc. was the very first company to realize this concept of PDA to market. However, Palm Inc. is most regarded as the founder of this emerging industry. During the nature of this competitive segment, Palm Inc. is now recognized from the leader of this segment that Palm created to the follower in less than15 years. The objective of this study is to determine the factors that impact the PDA/Smartphone industry. While these impacting factors can be further classified into Macroeconomic and Microeconomic aspects, the indexes of NASDAQ and the rival company Research In Motion (RIMM), are selected as variables to study the effect on Palm Inc., while Palm Inc. is selected as the benchmark for the overall PDA/ Smartphone industry. Market dynamics of PDA/Smartphone industry will be then discussed both in enterprise and consumer markets aspect, as well as future trends and limitations will also be elaborated with suggestion of future research directions on this PDA/Smartphone industry.