STAHL, Circuit,Judge.
The National Labor Relations Board appeals the denial of its petition for a preliminary injunction requiring Sullivan Brothers Printers, Inc., to recognize and bargain with Local 600M, Graphic Communications International Union (“GCIU”), AFL-CIO, as the exclusive representative of the Sullivan Brothers pressmen and bookbinders. The issue at the core of the dispute is whether Local 600M had properly assumed the mantle of two smaller, now-defunct locals that formerly represented the company’s pressmen and bookbinders. The district court concluded that the Board had failed to demonstrate a likelihood of success in the underlying proceeding and denied its petition for interim relief. Finding no abuse of discretion by the district court, we now affirm.
I.
Background
A. The Demise of Locals 109C and 139B
The relevant facts are undisputed. Sullivan Brothers is a commercial printing concern located in Lowell, Massachusetts. For more than thirty years, two separate locals represented the company’s pressmen and bookbinders — Local 109C and Local 139B, respectively, both affiliates of GCIU. Local 109C was the larger of the two locals, representing in 1990 more than 250 workers at five companies in the Lowell area, including eighteen pressmen at Sullivan Brothers. Local 139B represented about 135 bookbinders and general helpers at two companies in the same area, approximately ten of whom were employed by Sullivan Brothers. The vast majority of the members of each local — as many as 240 members of 109C, and 125 members of 139B — worked at another printing company, North American Directory Corporation (“NADCO”). Historically, NADCO workers dominated the leadership roles of both locals, occupying virtually all of the officer and executive board positions.
In June 1991, NADCO shut down its bindery, and in February 1993, it closed its plant altogether. NADCO’s closing reduced Local 109C to roughly forty members — about fifteen employed by Sullivan Brothers — and Local 139B to just eight to ten members, all at Sullivan Brothers. The shutdowns also left the two locals largely without leadership. Following the 1991 bindery closing, Local 139B president Oscar Becht and secretary-treasurer Jeannette Pickels, both NADCO employees, were the only local officers or directors remaining in office, having obtained other jobs in the NADCO plant pending the 1993 shutdown date. Local 109C president Henry Boermeester, a NADCO pressman, announced at a membership meeting in 1992
that he would step down when the plant closed the following year. None of the few dozen remaining members of the two locals expressed interest in filling any of the leadership positions at either local.
With membership at low levels — the GCIU constitution permits the international to rescind a local’s charter when membership dips below fifty — Boermeester and Becht began to explore and discuss with their members the possibility of merging the two locals or transferring
them to a larger local. The unwillingness of any remaining 109C and 139B members to assume leadership positions made merging the two locals impracticable.
Thus, in January 1993, Local 109C members voted to surrender their charter and transfer to Local 600M, a GCIU local headquartered in Boston comprising about 700 workers in the printing industry. The administrative transfer became effective on July 1, 1993. Local 139B members followed suit in March, with the transfer effective on May 1,1993. The two locals’ assets, totalling about $15,000, were transferred to Local 600M with no condition that they be used for the benefit of the 109C or 139B members.
B. Local 600M
Since they had joined a sister GCIU local, the former 109C and 139B members were still subject to the International’s constitution and by-laws. Local 600M’s structure, constitution and by-laws, however, differ from those of former locals 109C and 139B in a number of ways:
(1) Local 600M’s territory extends well beyond the Lowell area, covering about forty shops throughout eastern Massachusetts and southern New Hampshire. Its trade jurisdiction is also greater: while approximately 500 of its 700 members work in the same classifications as the 139B and 109C members, Local 600M accepts all types of printing industry workers, including shipping clerks, truck drivers, and envelope and box manufacturers.
(2) Local 600M dues are calculated on a sliding scale based on salary, rather than on a flat rate, as locals 109C and 139B calculated dues; thus, the pressmen would see their dues increase from $8 to $9.22 per week, while the bookbinders’ dues would increase from $6 to $7.95.
(3) Contract negotiation and ratification, as well as strike authorization, could also be different at Local 600M. As 109C and 139B members, the Sullivan Brothers bookbinders and pressmen were free to suggest contract terms for upcoming negotiations in informal “proposals meetings” held with their negotiators at a local donut shop or on the shop floor. A Local 600M by-law, however, requires members to submit proposed contract terms in writing to the president of the local at least ninety days before the contract expiration date. Another by-law gives the executive board the power to accept a contract against the wishes of a particular bargaining unit if the bargaining unit fails to approve the contract and at the same time fails to authorize, by a two-thirds majority, further action up to and including a strike. Locals 139B and 109C had no such by-law provisions. Local 600M by-laws also empower the executive board, on its own, to call a strike in unspecified “special cases” for any bargaining unit comprising fewer than twenty-five members — a category that includes the Sullivan Brothers pressmen’s and bookbinders’ units.
(4) Local 600M’s by-laws impose a number of new work restrictions on the Sullivan Brothers pressmen and bookbinders.
As
members of Local 600M, they may not: solicit or accept work without union consent; perform trade work outside the shop where they are regularly employed without union permission; work for wages less than those provided for in the contract under which they are covered without union approval; work overtime contrary to executive board order; or take vacation other than as prescribed by their governing contracts absent executive board permission to take money instead of scheduled vacation time.
(5) The leadership of Local 600M is almost entirely different from that of 109C and 139B. Of the defunct locals’ two dozen officers and directors, only Boermeester assumed any kind of role in Local 600M (or even joined it). With the aid of Local 600M president George Carlsen, Boer-meester obtained a seat on the local’s executive board for the duration of a departing board member’s term. Local 139B president Becht was offered a position on 600M’s board and was asked to assist in upcoming contract negotiations with Sullivan Brothers, but he turned down the board position and made only a tentative commitment to the negotiations, depending upon his availability. In addition, Steven Wysocki, Local 109C’s “chapel chairman,” or shop steward, at Sullivan Brothers, continued in the same capacity for the pressmen’s unit of 600M. Boermeester and Wysocki, who along with another 109C officer had negotiated Local 109C’s previous contracts with Sullivan Brothers, agreed to help Carlsen negotiate the next contract when the current contract expired in 1995. Boermeester already has negotiated contracts for the other two former 109C shops subsumed by 600M.
C. The Current Dispute
On July 6,1993, Local 600M formally notified Sullivan Brothers of the administrative transfers and asked the company to recognize and bargain with it as the exclusive representative of the former 109C and 139B members. The contract between 139B and Sullivan Brothers was due to expire on August 31, 1993; 109C’s contract was effective through May 31,1995. Local 600M proposed that Sullivan Brothers simply extend the 139B contract so that it expired contemporaneously with the 109C contract — adjusting it in the interim for wage and benefit increases granted in 109C’s most recent contract — so that contracts (or possibly a single contract) could be negotiated for the two units at the same time. On August 11, 1993, Sullivan Brothers informed Local 600M that it did not consider itself bound by the transfer and refused to recognize Local 600M. In addition, beginning on July 1, 1993, Sullivan Brothers took unilateral actions that Local 600M alleges unlawfully altered some of the terms and conditions of employment in the bookbinders’ and pressmen’s units.
Sullivan Brothers’ refusal to recognize Local 600M prompted Local 600M to file an unfair labor practice charge with the NLRB on August 23, 1993. The Board issued an unfair labor practice complaint on October 28, 1993, subsequently amended on January 20, 1994, which charged Sullivan Brothers with violating sections 8(a)(1) and (5) of the National Labor Relations Act, 29 U.S.C. §§ 158(a)(1) and (5), for refusing to bargain with Local 600M and for unilaterally changing the terms and conditions of employment. An administrative law judge (“ALJ”) conducted a hearing on the matter on February 3 and 4,1994.
On March 7,1994, more than
six months after it initially received the union’s complaint, and more than four months after it had issued its own complaint, the Board petitioned the district court for a temporary injunction pursuant to section 10(j) of the Act, 29 U.S.C. § 160(j).
The petition sought an order requiring Sullivan Brothers, pending final resolution of the issues raised in the underlying complaint, to recognize and bargain with Local 600M as the representative of the pressmen’s and bookbinders’ units, and to rescind, upon Local 600M’s request, certain unilateral changes made in the terms and conditions of the members’ employment.
The district court found that “a question exists as to the continuity of representation provided by Local 600M” and that the Board had failed to establish a likelihood of success on the merits, and concluded that injunctive relief was not just and proper. This appeal followed.
II.
The Section 10Q) Preliminary Injunction Standard
In considering a petition for interim relief under section 10(j), a district court must limit its inquiry to whether (1) the Board has shown reasonable cause to believe that the defendant has committed the unlawful labor practices alleged, and (2) whether injunctive relief is, in the language of the statute, “just and proper.”
See Asseo v. Centro Medico del Turabo,
900 F.2d 445, 450 (1st Cir.1990);
Asseo v. Pan American Grain Co.,
805 F.2d 23, 25 (1st Cir.1986);
Maram v. Universidad Interamericana de Puerto Rico, Inc.,
722 F.2d 953, 958 (1st Cir.1983). The district court is
not
empowered to decide whether an unfair labor practice actually occurred.
Centro Medico del Turabo,
900 F.2d at 450. In assessing whether the Board has shown reasonable cause, the district court need only find that the Board’s position is “fairly supported by the evidence.”
Id.
In satisfying the court that injunctive relief is just and proper, however, the Board faces a much higher hurdle, for here the district court must examine “the whole panoply of discretionary issues with respect to granting preliminary relief.”
Centro Medico del Turabo,
900 F.2d at 454 (quoting
Universidad Interamericana de Puerto Rico,
722 F.2d at 958). Thus, the district court must apply the familiar, four-part test for granting preliminary relief. Under this test, the Board must demonstrate:
(1) A likelihood of success on the merits;
(2) The potential for irreparable injury in the absence of relief;
(3) That such injury outweighs any harm preliminary relief would inflict on the defendant; and
(4) That preliminary relief is in the public interest.
See, e.g., Narragansett Indian Tribe v. Guilbert,
934 F.2d 4, 5 (1st Cir.1991);
Centro Medico del Turabo,
900 F.2d at 453. When, as in this ease, the interim relief sought by the Board “is essentially the final relief sought, the likelihood of success should be
strong.” Pan American Grain Co.,
805 F.2d at 29 (emphasis added).
Our reviéw of the district court’s analysis is limited. We review the court’s determination of reasonable cause for clear error, and we examine its ultimate decision to grant or deny equitable relief for abuse of discretion.
Centro Medico del Turabo,
900 F.2d at 450;
Pan American Grain Co.,
805 F.2d at 25. A court abuses its discretion
when, in determining the likelihood of success on the merits, it applies an improper legal standard or erroneously applies the law to particular facts.
Feinstein v. Space Ventures, Inc.,
989 F.2d 49, 51 (1st Cir.1993).
III.
Discussion
The Board argues on appeal that the district court erred in concluding that the Board failed to demonstrate a likelihood of success on the merits and that it abused its discretion in denying its petition for injunctive relief. We now address these arguments.
A. The District Court’s Ruling
1)
Reasonable Cause
The district court made no reasonable cause finding, instead proceeding directly to assess the Board’s likelihood of success on the merits. Neither party argues that this in itself constituted error; we assume
arguendo
that the district court did in fact find reasonable cause,
and turn to the district court’s determination that the Board failed to demonstrate a likelihood of success.
2)
No Likelihood of Success
The gravamen of the Board’s unfair labor practice complaint is that the administrative transfer of Locals 109C and 139B to Local 600M raised no question of representation. In other words, the Board asserts that Local 600M took over the representation of the Sullivan Brothers bookbinders and pressmen from locals 139B and 109C with sufficient continuity to keep intact Sullivan Brothers’ obligations to recognize and bargain with Local 600M and to perform under the existing collective bargaining agreements. The district court concluded that the Board had not demonstrated that it was likely to win that argument. In so holding, the district court relied primarily on (1) changes in leadership effected by the transfer; (2) changes in a number of the rights and duties of the local members; and (3) changes in the manner of negotiating, ratifying and administering contracts and calling strikes. The Board argues that these changes were nonexistent, illusory, or insufficient to constitute a change in the representative’s identity, and that the district court’s conclusion was erroneous.
We cannot say that any single one of the changes cited by the district court would result in a change of identity for a union, or even that, taken together, all of these changes will certainly result in an ultimate determination for Sullivan Brothers. Our task here is simply to determine whether the district court erred in finding significance in these facts and whether it abused its discretion in concluding that the Board had not demonstrated a clear likelihood of success. Bearing in mind that “[t]he ultimate question is whether the union ... operates in substantially the same way as it did before,”
Seattle-First Nat’l Bank v. NLRB,
892 F.2d 792, 799 (9th Cir.1989),
cert. denied,
496 U.S. 925, 110 S.Ct. 2618, 110 L.Ed.2d 639 (1990), we think
the district court acted well within its discretion by declining to answer that question in the affirmative.
To determine whether a particular affiliation, merger, or transfer interrupts an existing collective bargaining relationship, the Board asks: (1) whether the merger or transfer vote occurred under “circumstances satisfying minimum due process”
and (2) whether there was “substantial continuity” between the pre- and post-merger union.
Southwick Group d/b/a Toyota of Berkeley,
306 N.L.R.B. 893, 899,1992 WL 68668 (1992) (quoting
News/Sun-Sentinel Company,
290 N.L.R.B. 1171, 1988 WL 404708 (1988),
enforced
890 F.2d 430 (D.C.Cir.1989),
cert. denied,
497 U.S. 1003, 110 S.Ct. 3238, 111 L.Ed.2d 748 (1990));
see also Insulfab,
789 F.2d at 965.
The “substantial continuity” prong is a fact-intensive test that compares the pre- and post-merger labor organizations and asks “whether the changes are so great that a new organization has come into being — one that should be required to establish its status as a bargaining representative through the same means that any labor organization is required to use in the first instance.”
Toyota of Berkeley,
306 N.L.R.B. at 900. No single factor is determinative, nor is a particular checklist prescribed. Rather, “[t]he Board considers the totality of a situation.”
Id.
Among the factors that the Board has traditionally considered are: “the continued leadership responsibilities of existing union officials, the perpetuation of membership rights and duties, the continuance of the manner in which contract negotiations, administration, and grievance processing are effectuated, and the preservation of the certified representative’s assets, books and physical facilities.”
Id. See also Insulfab,
789 F.2d at 965 (listing as factors to consider “structure, administration, officers, assets, membership, autonomy, by-laws, size”) (quoting
NLRB v. Pearl Bookbinding,
517 F.2d 1108, 1111-12 (1st Cir.1975));
J. Ray McDermott & Co. v. NLRB,
571 F.2d 850, 857 (5th Cir.) (“we must consider whether changes have occurred in the rights and obligations of the union’s leadership and membership, and in the relationships between the putative bargaining agent, its affiliate, and the employer”), ce
rt. denied,
439 U.S. 893, 99 S.Ct. 250, 58 L.Ed.2d 238 (1978).
The Board argues that the district court erred in performing the substantial continuity analysis by exaggerating and overemphasizing changes in leadership while ignoring other evidence of continuity. We recognize that “there is no requirement that officers of a merged local must become
officers
of the new local,”
Service America Corp.,
307 N.L.R.B. 57, 60, 1992 WL 77803 (1992) (emphasis added), and that continued leadership may be provided by representatives other than union officers if they fill positions of responsibility and trust. As evidence of continuity of leadership, the Board points to the continuation of Wysocki in his role as shop steward, former Local 139B president Becht’s tentative commitment to participate in future negotiations, and former Local 109C president Boermeester’s election to Local 600M’s executive board and his continued participation in contract administration and negotiation.
The evidence, however, supports a finding that the transfer did in fact change the relationship between the putative bargaining agent and Sullivan Brothers. Becht’s tentative commitment remained just that, and Boermeester failed to obtain as a condition of the transfer an express guarantee that he would oversee day-to-day contract administration and future negotiations with Sullivan
Brothers. Moreover, Boermeester’s term on the executive board expires at the end of 1994, when he must face reelection before the entire local. Furthermore, Local 600M president Carlsen notified Sullivan Brothers in writing following the transfers that henceforth it would be
his
office that would handle contract administration, negotiations, and grievances, and that future communications concerning those matters should be directed accordingly.
Compare Toyota of Berkeley,
306 N.L.R.B. at 904 (finding substantial continuity following merger where,
inter alia,
former union’s principal official, as a condition of the merger, “continued to exercise sole control over the collective bargaining and day-to-day contract administration and grievance handling on behalf of employees formerly represented by [the merged] Local”).
In arguing that there was in fact continuity of leadership, the Board relies heavily on
Service America.
We fail to see how that case controls here. In
Service America^
the Board held that having new representatives negotiate and administer contracts following a merger does not necessarily defeat continuity, particularly when the former union would have undergone a change in leadership anyway.
Service America,
307 N.L.R.B. at 60. The circumstances in that case were entirely different, however, from the case at hand. First, the merging union in that ease, Local 513, still had 1,300 members and a full slate of its own local leaders when it merged with Local 115. Here, the evidence is undisputed that
no
members of Local 139B or 109C wished to take over positions of leadership within their own locals; the transfer occurred in part precisely because the workers had no more leaders and no prospects of finding any among the ranks — i.e., they had no more
representation.
Second, in
Service America,
both of Local 513’s top officials also served as business agents negotiating contracts and handling grievances for the union; they continued as full-time business agents, negotiating contracts and handling grievances, for Local 115. No former 109C or 139B officer has retained a similar position of responsibility as part of Local 600M. Wy-soeki’s continued stewardship and Boermees-ter’s position on Local 600M’s executive board represent
some
continuity of leadership for their former local; whether they represent
substantial
continuity is doubtful. Our attention has not been directed to any case in which the Board ultimately found substantial continuity when the affiliating or merging union has undergone the kind of transformation of leadership seen here.
See Garlock Equip. Co.,
288 N.L.R.B. 247-253, 1988 WL 213720 (1988) (“[T]he cases have placed emphasis upon whether unit employees have continued to be represented by the same officers operating' under the same procedures and with the same degree of autonomy as before the change.”).
A host of other factors further distinguishes this case from
Service America.
In that case, the dues structure remained virtually identical following the merger, contract ratification and strike vote procedures were similar, and some of Local 513’s assets were retained for the benefit of its members. Here, the district court found significant a number of changes in the structure of the union, in the bookbinders’ and pressmen’s rights and duties as members, and in the procedures for contract negotiation, ratification and strike votes.
The Board contends that the district court erred in assigning importance to these changes — particularly those concerning contract ratification and strike votes, which may be apparent in Local 600M’s by-laws but might never be put into practice. We recognize that actual union practice, and not just the letter of the by-laws, controls.
Central Washington Hosp.,
303 N.L.R.B. 404, 405, 1991 WL 113265 (1991);
Seattle-First Nat’l Bank,
892 F.2d at 799. In both of those eases, however, there was testimony that union practice was actually contrary to the bylaws in question. Here, Carlsen testified that Local 600M’s by-laws in fact permit the executive board to accept a contract against
the wishes of the majority of a bargaining unit’s members. The record contains no evidence that that particular provision, or any other provision in question, does
not
represent the actual practice of Local 600M.
As we have stated previously, interim relief in section 10(j) cases is not normally appropriate unless it is clear that ultimate success for the Board will “not prove difficult.”
Pan American Grain Co.,
805 F.2d at 29. From our perspective, however, the transfer of locals 139B and 109C to 600M exhibited no combination of characteristics on which the Board has typically based a finding of continuity in the past.
Cf., e.g., Service America,
307 N.L.R.B. 57, 1992 WL 77803 (1992) (finding continuity where merger resulted in positions of significant responsibility for former leaders, virtually identical rights, responsibilities and dues for members, and preservation of certain assets for benefit of former members);
Toyota of Berkeley,
306 N.L.R.B. 893 (1992) (finding continuity where former local was merged into sister local as separate, autonomous division with same trade and geographic jurisdiction; identical principal official and bargaining agent; identical authority of bargaining agent and members to negotiate and administer contracts, fashion bargaining proposals, and call strikes; virtually identical dues structure; and where by-laws of sister local were amended as a condition of the merger);
May Dep’t Stores Co.,
289 N.L.R.B. 661, 1988 WL 213935 (1988) (finding continuity where leadership, authority, dues, and rights and duties of members remained intact following merger of four locals into one local with four administrative districts),
aff'd,
897 F.2d 221 (7th Cir.),
cert. denied,
498 U.S. 895, 111 S.Ct. 245, 112 L.Ed.2d 204 (1990). Without some Board precedent finding continuity where the changes at least approach those seen here, we cannot say that the district court incorrectly applied the law in concluding that the Board had not shown a likelihood of success.
The district court did not analyze the Board’s petition under the remaining three requirements for injunctive relief, and we see no need to engage in that exercise here. Without a clear likelihood of success, injunc-tive relief would not have been just and proper.
See Weaver v. Henderson,
984 F.2d 11, 12 (1st Cir.1993) (“The
sine qua non
of [the injunctive relief analysis] is whether the plaintiffs are likely to succeed on the merits.”);
see also Pan American Grain Co.,
805 F.2d at 28 (stating that for an injunction to issue, the record must support a finding of a likelihood of success on the merits). Thus, the district court’s denial of injunctive relief was not an abuse of discretion.
AFFIRMED.