4 changed so what to who cares to make it more readable
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Verification: Did we build what the customer asked for?
Validation: Does what we built work?

Edit For Clarification:

"yet testers use functional spec for their test cases"

So whatWho cares if the testers use the functional spec they are still performing both Verification and Validation based on my original statements.

There are supposed to be three switches and two buttons on this wall. (verification)
The switches are supposed to be equi-distant apart and 48 inches off the floor (verification)
The buttons are supposed to be on either side of the switches (verification)
The left button is supposed to be labeled "Left" (verification)
The right button is supposed to be labeled "Right" (verification)
If I click the left button on, does it disable the far right switch? (validation)
If I click the left buton off, does it enable the far right switch? (validation)
If I click the right button on, does it disable the far left switch? (validation)
If I click the right button off, does it enable the far left switch? (validation)
If I click both buttons on does only the middle switch work? (validation)

Verification: Did we build what the customer asked for?
Validation: Does what we built work?

Edit For Clarification:

"yet testers use functional spec for their test cases"

So what if the testers use the functional spec they are still performing both Verification and Validation based on my original statements.

There are supposed to be three switches and two buttons on this wall. (verification)
The switches are supposed to be equi-distant apart and 48 inches off the floor (verification)
The buttons are supposed to be on either side of the switches (verification)
The left button is supposed to be labeled "Left" (verification)
The right button is supposed to be labeled "Right" (verification)
If I click the left button on, does it disable the far right switch? (validation)
If I click the left buton off, does it enable the far right switch? (validation)
If I click the right button on, does it disable the far left switch? (validation)
If I click the right button off, does it enable the far left switch? (validation)
If I click both buttons on does only the middle switch work? (validation)

Verification: Did we build what the customer asked for?
Validation: Does what we built work?

Edit For Clarification:

"yet testers use functional spec for their test cases"

Who cares if the testers use the functional spec they are still performing both Verification and Validation based on my original statements.

There are supposed to be three switches and two buttons on this wall. (verification)
The switches are supposed to be equi-distant apart and 48 inches off the floor (verification)
The buttons are supposed to be on either side of the switches (verification)
The left button is supposed to be labeled "Left" (verification)
The right button is supposed to be labeled "Right" (verification)
If I click the left button on, does it disable the far right switch? (validation)
If I click the left buton off, does it enable the far right switch? (validation)
If I click the right button on, does it disable the far left switch? (validation)
If I click the right button off, does it enable the far left switch? (validation)
If I click both buttons on does only the middle switch work? (validation)

3 deleted 4 characters in body
source | link

Verification: Did we build what the customer asked for?
Validation: Does what we built work?

Edit For Clarification:

"yet testers use functional spec for their test cases"

So what if the testers use the functional spec they are still performing both Verification and Validation based on my original statements.

There are supposed to be three switches and two buttons on this wall. (verification)
The switches are supposed to be equi-distant apart and 48 inches off the floor (verification)
The buttons are supposed to be on either side of the switches (verification)
The left button is supposed to be labeled "Left" (verification)
The right button is supposed to be labeled "Right" (verification)
If I click the left button on, does it disable the far right switchesswitch? (validation)
If I click the left buton off, does it enable the far right switchesswitch? (validation)
If I click the right button on, does it disable the far left switch? (validation)
If I click the right button off, does it enable the far left switch? (validation)
If I click both buttons on does only the middle switch work? (validation)

Verification: Did we build what the customer asked for?
Validation: Does what we built work?

Edit For Clarification:

"yet testers use functional spec for their test cases"

So what if the testers use the functional spec they are still performing both Verification and Validation based on my original statements.

There are supposed to be three switches and two buttons on this wall. (verification)
The switches are supposed to be equi-distant apart and 48 inches off the floor (verification)
The buttons are supposed to be on either side of the switches (verification)
The left button is supposed to be labeled "Left" (verification)
The right button is supposed to be labeled "Right" (verification)
If I click the left button on, does it disable the far right switches? (validation)
If I click the left buton off, does it enable the far right switches? (validation)
If I click the right button on, does it disable the far left switch? (validation)
If I click the right button off, does it enable the far left switch? (validation)
If I click both buttons on does only the middle switch work? (validation)

Verification: Did we build what the customer asked for?
Validation: Does what we built work?

Edit For Clarification:

"yet testers use functional spec for their test cases"

So what if the testers use the functional spec they are still performing both Verification and Validation based on my original statements.

There are supposed to be three switches and two buttons on this wall. (verification)
The switches are supposed to be equi-distant apart and 48 inches off the floor (verification)
The buttons are supposed to be on either side of the switches (verification)
The left button is supposed to be labeled "Left" (verification)
The right button is supposed to be labeled "Right" (verification)
If I click the left button on, does it disable the far right switch? (validation)
If I click the left buton off, does it enable the far right switch? (validation)
If I click the right button on, does it disable the far left switch? (validation)
If I click the right button off, does it enable the far left switch? (validation)
If I click both buttons on does only the middle switch work? (validation)

2 added 1080 characters in body
source | link

Verification: Did we build what the customer asked for?
Validation: Does what we built work?

Edit For Clarification:

"yet testers use functional spec for their test cases"

So what if the testers use the functional spec they are still performing both Verification and Validation based on my original statements.

There are supposed to be three switches and two buttons on this wall. (verification)
The switches are supposed to be equi-distant apart and 48 inches off the floor (verification)
The buttons are supposed to be on either side of the switches (verification)
The left button is supposed to be labeled "Left" (verification)
The right button is supposed to be labeled "Right" (verification)
If I click the left button on, does it disable the far right switches? (validation)
If I click the left buton off, does it enable the far right switches? (validation)
If I click the right button on, does it disable the far left switch? (validation)
If I click the right button off, does it enable the far left switch? (validation)
If I click both buttons on does only the middle switch work? (validation)

Verification: Did we build what the customer asked for?
Validation: Does what we built work?

Verification: Did we build what the customer asked for?
Validation: Does what we built work?

Edit For Clarification:

"yet testers use functional spec for their test cases"

So what if the testers use the functional spec they are still performing both Verification and Validation based on my original statements.

There are supposed to be three switches and two buttons on this wall. (verification)
The switches are supposed to be equi-distant apart and 48 inches off the floor (verification)
The buttons are supposed to be on either side of the switches (verification)
The left button is supposed to be labeled "Left" (verification)
The right button is supposed to be labeled "Right" (verification)
If I click the left button on, does it disable the far right switches? (validation)
If I click the left buton off, does it enable the far right switches? (validation)
If I click the right button on, does it disable the far left switch? (validation)
If I click the right button off, does it enable the far left switch? (validation)
If I click both buttons on does only the middle switch work? (validation)

1
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