Ian Mattis petitions for review of the Board of Immigration Appeals’ (hereinafter BIA) denial of his motion to reopen deportation proceedings to apply for adjustment of status under 8 U.S.C. § 1255 (a). Mattis contends that the BIA abused its discretion in: (1) concluding that he failed to make a prima facie case of extreme hardship to his United States citizen wife under 8 U.S.C. § 1182 (h); and (2) denying his motion to reopen to apply for adjustment of status under 8 U.S.C. § 1255 (a) as a matter of discretion.

FACTS

Mattis, a native and citizen of Jamaica, entered the United States as a permanent resident in November 1975. He was convicted of two misdemeanor shoplifting offenses in September 1979 and in May 1980. In December 1981, an immigration judge found him deportable as an alien convicted of two crimes involving moral turpitude, and the BIA affirmed. This court dismissed Mattis’s petition for review for failure to prosecute on October 13, 1982.

On October 21, 1982, the Immigration and Naturalization Service (hereinafter INS) notified Mattis to report for deportation on October 27, 1982. The INS agreed to extend the deportation date until October 29, 1982. On October 28, 1982, Mattis moved to reopen deportation proceedings to apply for adjustment of status based on his October 26, 1982 marriage to a United States citizen.

To establish eligibility for adjustment of status, an alien must show that: (1) he has applied for adjustment; (2) he is eligible to receive an immigrant visa and is admissible for permanent residence; and (3) an immigrant visa is immediately available to him. 8 U.S.C. § 1255 (a). Mattis is excludable from admission into the United States because of his prior shoplifting convictions. 8 U.S.C. § 1182 (a)(9). To qualify for adjustment of status, therefore, Mattis must obtain a waiver of excludability under 8 U.S.C. § 1182 (h). To obtain a waiver of excludability, he must establish, inter alia, that his exclusion will result in extreme hardship to his United States citizen wife. 8 U.S.C. § 1182 (h). Thus, in order to demonstrate admissibility under 8 U.S.C. § 1255 (a) (adjustment of status), Mattis must establish extreme hardship to his United States citizen wife, qualifying him for a waiver of'excludability under 8 U.S.C. § 1182 (h). The BIA denied Mattis’s motion to reopen for failure to make a prima facie case of extreme hardship to his United States citizen wife. The BIA also held that, even assuming Mattis’s statutory eligibility for adjustment of status, the motion should be denied as a matter of discretion.

DISCUSSION

A. Extreme Hardship

The BIA has broad discretion when ruling on motions to reopen, but it may not exercise its discretion in a way that is arbitrary, irrational or contrary to law. Patel v. INS, 741 F.2d 1134, 1136 (9th Cir.1984). In reviewing a BIA decision for abuse of discretion, we require that its stated reasons evidence its consideration of all relevant factors. Batoon v. INS, 707 F.2d 399, 401 (9th Cir.1983). Cursory, summary or conclusory statements are inadequate. Patel, 741 F.2d at 1137 ; Batoon, 707 F.2d at 401 . Moreover, the BIA’s denial of relief can be affirmed only on the basis articulated in the decision, Ro v. INS, 670 F.2d 114, 116 (9th Cir.1982), and we cannot assume that the BIA considered factors that it failed to mention in its decision. Batoon, 707 F.2d at 402 .

Along with his application for waiver of excludability and motion to reopen, Mattis and his wife submitted numerous affidavits and other evidentiary material relating to the asserted extreme hardship that Mattis’s deportation would cause his wife. In denying the motion to reopen, the BIA addressed none of this evidence. The BIA simply stated that Mattis had failed to establish statutory eligibility because he had not shown that his deportation would result in extreme hardship to his United States citizen wife. The BIA articulated no reasons for reaching this conclusion. Thus, whether or not Mattis presented sufficient evidence to establish a prima facie case of hardship, the BIA’s failure to address the evidence presented or to articulate reasons for its negative conclusion was an abuse of discretion requiring reversal and remand. Battoon, 707 F.2d at 401 ; Sida v. INS, 665 F.2d 851, 854-55 (9th Cir.1981); Perez v. INS, 643 F.2d 640, 641 (9th Cir.1981), cert. dismissed, 459 U.S. 983 , 103 S.Ct. 320 , 74 L.Ed.2d 296 (1982).

B. Discretionary Denial

After this matter was submitted to us for decision and the filing of our original opinion in this matter, the Supreme Court decided INS v. Rios-Pineda, — U.S. —, 105 S.Ct. 2098 , 85 L.Ed.2d 452 (1985). In Rios-Pineda , the Supreme Court held that “even assuming that respondents’ motion to reopen made out a prima facie case of eligibility for suspension of deportation, the Attorney General had discretion to deny the motion to reopen.” Id. 105 S.Ct. at 2102 . The Court in Rios-Pineda examined the separate and adequate reasons noted by the BIA in exercising its discretion to deny the motion to reopen. Id. at 2102-03 . The Court concluded that the “BIA’s explanation of its decision was grounded in legitimate concerns about the administration of the immigration laws and was determined on the basis of the particular conduct of respondents.” Id. at 2103 (emphasis added).

Thus, it is our duty under Rios-Pineda to uphold the denial of a motion to reopen notwithstanding the fact that a prima facie case for reopening has been made out, if the BIA has provided a reasoned explanation for the exercise of its discretion to refuse to reopen based upon “legitimate concerns.” Id. We conclude after reviewing the entire record that the BIA failed to give a non-arbitrary reasoned explanation for its denial of the motion to reopen as required by Rios-Pineda and the law of this circuit.

When the BIA denies relief as a matter of discretion, it may not exercise its discretion arbitrarily. Patel v. INS, 741 F.2d 1134, 1136 (9th Cir.1984). See also INS v. Bagamasbad, 429 U.S. 24, 26 , 97 S.Ct. 200, 201 , 50 L.Ed.2d 190 (1976) (basis for the BIA’s discretionary findings must be set forth in writing). BIA discretionary denials must show that the BIA weighed both favorable and unfavorable factors. De La Luz v. INS, 713 F.2d 545, 546 (9th Cir.1983). We have consistently required the BIA to state its reasons and show proper consideration of all factors when weighing equities and denying relief. See Ahwazi v. INS, 751 F.2d 1120, 1122-23 (9th Cir.1985); Ramirez-Gonzalez v. INS, 695 F.2d 1208, 1213 (9th Cir.1983); Contreras-Buenfil v. INS, 712 F.2d 401, 403 (9th Cir.1983); Ro v. INS, 670 F.2d 114, 116 (9th Cir.1982); Villena v. INS, 622 F.2d 1352, 1361, n. 2 (9th Cir.1980) (en banc). Where factual assertions in affidavits supporting a motion to reopen are specific and not conclusory, moreover, the BIA must accept their truth unless they are inherently incredible. See Agustin v. INS, 700 F.2d 564, 565 (9th Cir.1983); Reyes v. INS, 673 F.2d 1087, 1090 (9th Cir.1982); Hamid v. INS, 648 F.2d 635, 637 (9th Cir.1981).

The only reason advanced by the BIA to support its decision was that Mattis’ “last-minute marriage” did not present substantial equities. The BIA did not consider the marriage a sham, but concluded that it was suspect because it occurred on the day before Mattis’s scheduled deportation.

Mattis and his wife asserted, by affidavit and other evidentiary material, that they: (1) were in love; (2) had lived together since April 1982; (3) had commingled their funds since July 1982; (4) intended to marry and establish a life together; (5) became engaged in June 1982; and (6) married earlier than their planned wedding date when Mattis was notified that he would be deported. Mattis also asserted that he was gainfully employed, had never been on public assistance, and had not been involved in criminal activities since his May 1980 misdemeanor conviction.

The BIA did not specifically find any of these allegations inherently incredible, but it apparently disbelieved the evidence concerning the bona fides of the marriage because it considered only the timing of the marriage and concluded that the marriage presented no substantial equities. The BIA ignored evidence that Mattis was gainfully employed and financially responsible, as well. The BIA abused its discretion when it failed to consider this evidence, De la Luz, 713 F.2d at 546 , and when it disbelieved affidavit evidence that was not inherently incredible. Agustin, 700 F.2d at 565 ; Reyes, 673 F.2d at 1090 .

CONCLUSION

The BIA failed to give a reasoned explanation for the exercise of its discretion to deny the motion to reopen as required by Rios-Pineda . Reliance by the BIA on the fact that Mattis entered into a “last-minute marriage” does not demonstrate a legitimate concern about the administration of the immigration laws in light of the BIA’s determination that the marriage was not a sham.

The BIA’s decision is REVERSED and REMANDED.

. Section 1182(h) also requires a showing that the alien’s admission into the United States "would not be contrary to the national welfare, safety, or security of the United States____" 8 U.S.C. § 1182 (h). . Motions to reopen will not be granted where prima facie eligibility for the relief requested is lacking. See Villena v. INS, 622 F.2d 1352, 1358 (9th Cir.1980) (en banc). See generally 8 C.F.R. § 242.22 (1984) (motions to reopen).