Table 1: Anticipatory steps to minimize internal validity threats [⁴⁰].

Weaknesses	Things done to minimize weaknesses
History	Agreement with the hospital management that there was no other treatment between pre and post test.
Maturation	The time gap between pre and post was only two months.
Testing	Measurement of dependent variables was carried out by the observer instead of the self report.
Instrumentation	Pre- test and post- test observations were carried out by different rater