Step 1: Principle 1:
Science, not Rule of Thumb: Replace old, traditional rule-of-thumb work methods with methods based on scientific study and analysis of each element of a job.
Step 2: Principle 2:
Harmony, not Discord: Management should bring about complete harmony between labour and management rather than discord, since both need each other for mutual benefit.
Final Answer:
Two Taylor principles: (1) Science, not Rule of Thumb, and (2) Harmony, not Discord.