Positive Work Environment Performance Data Summary 2005-2008

		2008	2007	2006	2005
Total compensation paid to employees/payroll excluding benefits (US$)		5.03B	5.56B	5.14B	4.84B
Contribution through Partnership 4 Giving**** (US$)		25M	23M	21.7M	19.2M
Percentage for employee categorization which are covered by a predefined and standardized performance appraisal process		100	100	N/R	N/R
	Executives	100	100	N/R	N/R
	Middle Management	100	100	N/R	N/R
	Line supervisors	100	100	N/R	N/R
	Individual Contributors†	100	90	N/R	N/R
Overall turnover rate****		17.6	10.7	11.9	10.6
	Overall Voluntary Turnover Rate	8.1	6.6	7.1	7.1
	Overall Avoidable Voluntary Turnover Rate	4.6	3.8	4.3	4.1
Overall unavoidable voluntary turnover rate		3.4	2.8	2.8	3.0
Involuntary termination rate		9.8	4.1	4.8	3.5

^* All data pertains to representation in Merck's workforce.
^** Executives refer to the level of voice president.
^***These figures include the donor contributions and The Merck Company Foundation matching funds.
^****Overall turnover includes all types of turnover; overall voluntary turnover excludes any involuntary terminations for performance or restructuring; overall avoidable voluntary turnover includes only turnover that the Company may have been able to prevent but excludes separation considered unavoidable such as death, return to school, relocation for spouse, etc.
^†Percentage does not include employees who are covered under a collective bargaining agreement.