The FMPS is a 35-item self-report questionnaire to measure perfectionism. It evaluates: concern over mistakes/CM, doubts about actions/DA, parental criticism/PC and expectations/PE, personal standards/PS and organization/O.

To develop a shortened version of FMPS and study its internal consistency, the construct, concurrent and divergent validity.

One hundred and ninety-two university students (78.1% females), aged 19.74 years (sd=2.10) completed the Portuguese versions of the: FMPS, Hewitt and Flett MPS/H&FMPS, Life Orientation Test Revised/LOT-R, State-Trait Anxiety Inventory/STAI, and Profile of Mood States/POMS.

Correlations between each item and corrected FMPS total scores/corrected total subscales scores were≥0.20 for the items 13, 15, 25, 31, 35 and 10, 2, 25, and 26, respectively. The internal consistency of FMPS was high (α: .857) with 32 items contributing for this consistency (exceptions: 13, 25 and 31). The principal component analysis of the 35 items with factors varimax rotation was performed. The three items with higher loading in each factor that also contributed to the FMPS reliability were selected for the FMPS shortened version (FMPS-18). The principal component analysis of the 18 items with factors varimax rotation showed that six factors explained 74.6% of FMPS-18 total variance. These factors revealed adequate internal consistency (α: O=0.740; PC=0.859; PE=0.847; PS=0.726; CM=0.740; DA=0.832; total=0.768). Convergent correlations between FMPS and the matched FMPS-18 scores were 0.839 to 0.971 (all P<.01). Correlations of the FMPS-18 and FMPS with H&F-MPS, STAI, LOT-R and NA/PA scores were of similar significance and valence.

FMPS-18 is a brief, reliable and valid instrument to measure perfectionism.