IDEL Fluidez en las Palabras sin Sentido

Description of the FPS Measure

Fluidez en las Palabras sin Sentido (FPS) is a standardized, individually-administered test of the alphabetic principle - including letter-sound correspondence and the ability to blend letters into words (Kaminski & Good, 1996). The student is presented with an 8.5" x 11" sheet of paper with randomly ordered CV and CVCV nonsense words (e.g., ro, lali, sepi) and asked to produce verbally either the individual letter sound of each letter or read the whole nonsense word. For example, if the stimulus word is "sepi" the student could say /s/ /e/ /p/ /i/or say the word /sepi/ to obtain a total of four letter-sounds correct. The student is allowed 1 minute to produce as many letter-sounds as he/she can, and the final score is the number of letter-sounds produced correctly in one minute. Because the measure is fluency based, students receive a higher score if they are phonologically recoding the word and receive a lower score if they are providing letter sounds in isolation. The FPS measure takes about 2 minutes to administer and has over 20 alternate forms for monitoring progress. The benchmark goal for Fluidez en las Palabras sin Sentido is 90 correct letter sounds per minute with at least 30 words correctly recoded as whole words by the end of first grade.

Technical Adequacy of the FPS Measure

The three-week, alternate-form reliability for FPS in the middle of first grade is .76 (Baker, Good, Peyton, & Watson, unpublished data). The concurrent criterion-validity of FPS with the Woodcock-Muñoz Pruebas de Aprovechamiento subtest of Análisis de Palabras is .72 at the end of first grade (Watson, 2004).

How does the FPS measure link to DIBELS?

IDEL FPS is similar to the DIBELS Nonsense Word Fluency measure.

How does the FPS measure link to the Big Ideas in Beginning Reading?

Like the DIBELS Nonsense Word Fluency (NWF) measure, the FPS assesses students' understanding of the alphabetic principle. The alphabetic principle is the ability to associate sounds with letters and use those sounds to form words. It is composed of two parts:

  • Alphabetic Understanding: Words are composed of letters that represent sounds.
  • Phonological Recoding: Using systematic relationships between letters and phonemes (letter-sound correspondence) to retrieve the pronunciation of an unknown printed string of letters, or to spell a word.

    Phonological recoding is the ability to:

    • read from left to right, simple, unfamiliar regular words.
    • generate the sounds for all letters.
    • blend sounds into recognizable words.

    Beginning spelling is the ability to:

    • translate speech to print using phonemic awareness and knowledge of letter-sounds.


What are the benchmark goals for the FPS measure?

View the benchmark goals for all the IDEL measures.