Where "ensayos" means "tests" and "recontrol" means "control." Note: I could not find "recontrol" in any Spanish dictionary but I am presuming that this is an instance of Spanish using the prefix "re" to give emphasis to the verb's semantic content (e.g., "recoger" in many Latin American dialects).

For an example of the phrase in English, see:

To ensure an effective test and evaluation program, security management best practices prescribe that the scope of information system control tests include an evaluation of recently identified weaknesses and an assessment of emerging security threats to the computer control environment.

http://www.gao.gov/new.items/d04630.pdf

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Note added at 3 hrs (2009-07-14 00:01:51 GMT)
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Input validation tests are often referred to as edit tests because they are control tests built into the application to examine input data for obvious errors. Edit tests are designed to review transactions much like experienced personnel do in manual systems in which an employee would know, for example, that no one worked more than 55 hours in the past week.

http://home.millsaps.edu/burkekg/audch8.htm

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Note added at 3 hrs (2009-07-14 00:03:55 GMT)
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These requirements represent the standard of practice and are in compliance with requirements and recommendations of the Joint Commission on the Accreditation of Healthcare Organizations (JCAHO) and State and Federal agencies. Documentation of compliance with all quality control tests and corrective action is required as part of the application process.

http://acr.org/accreditation/nuclear/qc_forms/FeaturedCatego...

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Note added at 3 hrs (2009-07-14 00:06:30 GMT)
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Quality Assurance is defined as those planned and systematic operations conducted to ensure that the operation and/or product meets specifications ... verifying the
results of quality control and process control testing; and inspecting for conformance to plans and specifications ...

http://www.dot.ca.gov/hq/construc/qcqaman1.html

I think it's a typo and should be precontrol (pre-control) tests.

Here are some examples in Spanish and English:

IngentaConnect Monitoring process parameters with pre-control -Abstract: Many manufacturers have reported success in using Pre-Control (PC) procedures to monitor their processes. ...
www.ingentaconnect.com/content/els/02726963/1995/.../

Testimonial - Levulose Trail Studies - The long-term safety of Levulose consumption was studied and evaluated in 14 ... or urate occurred between precontrol, Levulose, or postcontrol period. ...
www.diabeticsdezire.com/testimonials_2.asp -

Tecnologia de la llavor
Ensayos de identidad: Identificación de colecciones. Ensayos de verificación de la variedad. Ensayos de Verificación de. Autenticidad. Ensayos de Precontrol ...
www.etsea.udl.es/cat/.../Tecnologia de la llavor.pdf - Similares -